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-package squidpony.squidmath;
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-
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-import java.io.Serializable;
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-import java.util.Map;
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-
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-/**
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- * A class that wraps an RNG and allows different String keys to be associated with biases toward low or high results
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- * when a method is called that gets a number from the wrapped RNG. With this, you could make a category of "blessed" or
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- * "cursed" biases that, instead of using a uniform distribution that produces all numbers approximately with equal
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- * likelihood (with doubles between 0.0 and 1.0 averaging at 0.5), have different averages, like 0.7 for blessed or 0.3
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- * for cursed, when generating between 0.0 and 1.0. You could also use this to favor or disfavor the player for "easy
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- * mode" or "hard mode" categories of play.
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- * <br>
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- * The API allows you to associate an alternative average with a kind as a String, like "blessed to-hit" or "hard mode
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- * enemy damage", if you expect to use that number more than once and might want to tweak any averages by changing one
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- * number at a later point. You can also give an average as a double in place of a kind as a String, which avoids a
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- * HashMap lookup and lets you give flexibly-adjusted numbers, but does need more effort to change many values
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- * throughout a codebase if averages aren't all generated by a formula. You can also set the distribution in the
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- * constructor or by changing the public distribution field; you can use constants in this class, TRIANGULAR,
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- * EXPONENTIAL, TRUNCATED, SOFT_TRIANGULAR, and EXP_TRI (the average of EXPONENTIAL and TRIANGULAR), for different
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- * choices, with the default being EXP_TRI. Each one of these has different behavior regarding a preference toward
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- * extreme values; TRIANGULAR almost never produces very high or very low values, EXPONENTIAL frequently produces the
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- * highest or lowest values for high or low expected averages, respectively, TRUNCATED will simply never generate values
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- * that are too far from the average (otherwise it's uniform), SOFT_TRIANGULAR will produce a rounded version of
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- * TRIANGULAR's distribution with less of an angular peak and more frequent high and low values, and EXP_TRI will have
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- * something like a curve shape that may "collide" slightly with the upper bound if the average is high enough.
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- * <br>
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- * Credit for the technique used for the exponential modification to distributions goes to user pjs on StackOverflow,
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- * http://stackoverflow.com/a/17796997 .
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- * Credit should also be given to user vydd of the LispGames community, who made a visualization of the distribution
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- * changing as the expected average changed (at the time, the typical behavior of an exponential distribution looked
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- * like a bug, and the visualization showed that it was correct behavior). Derrick Creamer noticed how strange the
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- * exponential distribution would seem to most players, and that led to adding the simple triangular distribution.
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- * Created by Tommy Ettinger on 3/20/2016.
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- */
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-public class RandomBias implements Serializable {
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- private OrderedMap<String, Double> biases;
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- public RNG rng;
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- public int distribution = EXP_TRI;
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-
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- /**
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- * A constant for a distribution that linearly increases in probability from a 0.0 chance of 0.0. to a 0.3333...
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- * chance of getting the expected average, then linearly decreases until it reaches a 0.0 chance of 1.0. Doesn't
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- * really support expected averages below 1/3 or above 2/3, due to how the triangular distribution works.
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- */
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- public static final int TRIANGULAR = 0,
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- /**
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- * A constant for a distribution that, for all values other than 0.5, will strongly favor either high or low
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- * results to push the odds in favor of a high or low expected average. This is probably not what most players
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- * expect, since it leads to massively more critical hits or failures if min or max results are counted as such.
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- */
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- EXPONENTIAL = 1,
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- /**
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- * Not like the other distributions; this is a constant for a distribution that simply truncates a random number's
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- * possible range to less than 1.0, and adjusts the minimum or maximum value so that the average is the desired one.
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- * This is a uniform random number generator, unlike the others which have a bias toward certain values; it simply
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- * cannot generate values outside a certain range, and the values within the range it generates are all equally
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- * likely. The range gets smaller the closer the expected average is to 0.0 or 1.0, with an expected average of 0.4
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- * producing values between 0.0 and 0.8, and an expected average of 0.9 producing values of 0.8 to 1.0 (in all
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- * cases, this is exclusive on the upper bound).
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- */
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- TRUNCATED = 2,
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- /**
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- * A constant for a distribution that averages two random floats, each with a triangular distribution (the same as
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- * what using the TRIANGULAR constant would produce, but the distribution becomes more curved when multiple random
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- * "dice rolls" are involved), to soften the point of the triangle and make very high or very low values appear
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- * somewhat more frequently, while the expected average appears less frequently. This should not be used to generate
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- * very large numbers, since the floats this uses lose precision after 24 bits, or about 16 million. It should
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- * produce very reasonable results for common values in games, like 0 to 100 or 0 to 20. Doesn't really support
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- * expected averages below 1/3 or above 2/3, due to how the triangular distribution works.
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- */
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- SOFT_TRIANGULAR = 3,
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- /**
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- * A constant for a distribution that averages two random floats, one with a triangular distribution (the same as
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- * what using the TRIANGULAR constant would produce), and one with an exponential distribution (the same as what
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- * using the EXPONENTIAL constant would produce) to soften the point of the triangle and make very high or very low
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- * values appear much more frequently, while the expected average appears somewhat less frequently. This should not
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- * be used to generate very large numbers, since the floats this uses lose precision after 24 bits, or about 16
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- * million. It should produce very reasonable results for common values in games, like 0 to 100 or 0 to 20. Has
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- * limited support for expected averages below 1/3 or above 2/3; unlike TRIANGULAR or SOFT_TRIANGULAR, expected
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- * averages outside that range will still affect the generated average due to the EXPONENTIAL distribution
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- * contributing half of the correction needed to match the expected average. An expected average of 5/6 will produce
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- * an approximate average with this of 3/4, as opposed to 2/3 (for pure TRIANGULAR) or 5/6 (for EXPONENTIAL).
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- */
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- EXP_TRI = 4,
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- /**
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- * "Bathtub-shaped" or "U-shaped" distribution (technically the arcsine distribution) that is significantly more
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- * likely to produce results at either extreme than it is to generate them in the center. The extremes in this case
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- * are the same as the truncated distribution, so not all values are possible unless the expected average is 0.5.
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- */
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- BATHTUB_TRUNCATED = 5;
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-
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- private static final int softRange = 1 << 24;
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-
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- private static final long serialVersionUID = 4245874924013134958L;
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-
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- public RandomBias()
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- {
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- biases = new OrderedMap<>(32);
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- rng = new RNG();
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- }
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- public RandomBias(RNG rng)
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- {
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- this.rng = rng;
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- biases = new OrderedMap<>(32);
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- }
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- public RandomBias(RNG rng, Map<String, Double> mapping)
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- {
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- this(rng, mapping, EXP_TRI);
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- }
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- public RandomBias(RNG rng, Map<String, Double> mapping, int distribution) {
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- this.rng = rng;
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- this.distribution = distribution;
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- if (mapping == null) {
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- biases = new OrderedMap<>(32);
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- } else {
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- biases = new OrderedMap<>(mapping.size());
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- double exp;
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- for (Map.Entry<String, Double> kv : mapping.entrySet()) {
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- exp = kv.getValue();
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- if (exp <= 0) exp = 0.001;
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- if (exp >= 1) exp = 0.999;
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- biases.put(kv.getKey(), exp);
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- }
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- }
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- }
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-
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- /**
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- * Adds a kind of bias that can be used to change the average of random numbers generated when specified with that
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- * kind.
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- * @param kind a String that will be used as a key in a Map; can be given later on to bias results using this key
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- * @param expectedAverage above 0.0 and below 1.0, with 0.5 as the normal average but other values are more useful.
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- * @return this for chaining
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- */
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- public RandomBias putBias(String kind, double expectedAverage)
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- {
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- if(expectedAverage <= 0) expectedAverage = 0.001;
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- if(expectedAverage >= 1) expectedAverage = 0.999;
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- biases.put(kind, expectedAverage);
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- return this;
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- }
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- /**
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- * Adds a number of kinds of bias that can be used to change the average of random numbers generated when specified
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- * with one of those kinds.
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- * @param mapping should have String keys that can be used later, and double values greater than 0 but less than 1.
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- * @return this for chaining
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- */
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- public RandomBias putBiases(Map<String, Double> mapping)
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- {
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- double exp;
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- for(Map.Entry<String, Double> kv : mapping.entrySet())
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- {
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- exp = kv.getValue();
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- if(exp <= 0) exp = 0.001;
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- if(exp >= 1) exp = 0.999;
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- biases.put(kv.getKey(), exp);
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- }
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- return this;
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- }
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-
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- private double quantile(double expected)
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- {
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- switch (distribution)
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- {
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- case EXPONENTIAL: return exponentialQuantile(expected);
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- case TRUNCATED: return truncatedQuantile(expected);
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- case TRIANGULAR: return triangularQuantile(expected);
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- case SOFT_TRIANGULAR: return softQuantile(expected);
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- case BATHTUB_TRUNCATED: return bathtubTruncatedQuantile(expected);
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- default: return mixQuantile(expected);
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- }
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- }
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-
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- private double triangularQuantile(double expected)
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- {
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- expected = Math.max(0.001, Math.min(0.999, expected * 3.0 - 1.0));
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- double p = rng.nextDouble();
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- if(p < expected)
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- return Math.sqrt(expected * p);
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- if(p > expected)
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- return 1 - Math.sqrt((1 - expected) * (1 - p));
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- return expected;
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- }
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- private double truncatedQuantile(double expected)
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- {
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- if(expected >= 0.5)
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- return rng.nextDouble() * (1.0 - expected) * 2 + expected - (1.0 - expected);
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- return rng.nextDouble() * expected * 2;
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- }
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- private double bathtubQuantile(double expected)
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- {
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- expected = Math.sin(expected * Math.PI * 0.5);
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- return expected * expected;
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- }
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- private double bathtubTruncatedQuantile(double expected)
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- {
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- if(expected >= 0.5)
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- return bathtubQuantile(rng.nextDouble()) * (1.0 - expected) * 2 + expected - (1.0 - expected);
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- return bathtubQuantile(rng.nextDouble()) * expected * 2;
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- }
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- private double exponentialQuantile(double expected)
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- {
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- return 0.9999999999999999 - Math.pow( rng.nextDouble(), 1.0 / (1.0 - expected) - 1.0);
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- }
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- private static float longToFloat(long n)
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- {
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- return n * 1.0f / softRange;
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- }
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- private double softQuantile(double expected)
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- {
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- expected = Math.max(0.001, Math.min(0.999, expected * 3.0 - 1.0));
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- long pair = rng.nextLong();
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- float left = longToFloat(pair >>> 40), right = longToFloat((pair >>> 16) & 0xFFFFFFL);
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- double v;
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-
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- if(left < expected)
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- v = Math.sqrt(expected * left);
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- else if(left > expected)
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- v = 1 - Math.sqrt((1 - expected) * (1 - left));
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- else
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- v = expected;
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- if(right < expected)
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- return (v + Math.sqrt(expected * right)) * 0.5;
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- if(right > expected)
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- return (v + 1 - Math.sqrt((1 - expected) * (1 - right))) * 0.5;
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- return expected;
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- }
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- private double mixQuantile(double expected)
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- {
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- double d2 = Math.max(0.001, Math.min(0.999, expected * 3.0 - 1.0)), v;
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- long pair = rng.nextLong();
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- float left = longToFloat(pair >>> 40), right = longToFloat((pair >>> 16) & 0xFFFFFFL);
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-
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- if(left < d2)
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- v = Math.sqrt(d2 * left);
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- else if(left > d2)
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- v = 1 - Math.sqrt((1 - d2) * (1 - left));
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- else
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- v = d2;
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- return (Math.pow( right, 1.0 / expected - 1.0) + v) * 0.5;
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- }
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- /**
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- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
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- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
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- * expected average the kind was associated with. The returned number will be a positive long in either case, but
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- * not all long values are possible if this is biased, in part because of generating a double, which has less
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- * precision than long, and in part because some numbers need to be more common than others. If the kind is not in
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- * the map, this generates a positive long, using 63 bits instead of RNG's normal 64 bits since it never generates
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- * negative numbers.
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- * @param kind the kind of bias to look up
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- * @return a random 63-bit positive long, potentially influenced by the bias associated with kind, if present
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- */
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- public long biasedLong(String kind)
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- {
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- Double d = biases.get(kind);
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- if(d == null)
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- return rng.nextLong() >>> 1;
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- return (long)(quantile(d) * Long.MAX_VALUE);
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- }
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-
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- /**
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- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
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- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
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- * expected average the kind was associated with. The returned number will be a long between 0 and bound (exclusive
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- * on bound), where bound can be negative (and this behavior is allowed even though RNG normally returns 0 for all
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- * negative bounds). If the kind is not in the map, this generates a long between 0 and bound (exclusive on bound),
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- * even if bound is negative.
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- * @param kind the kind of bias to look up
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- * @param bound the outer bound, exclusive; can be negative
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- * @return a random long between 0 and bound, potentially influenced by the bias associated with kind, if present
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- */
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- public long biasedLong(String kind, long bound)
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- {
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- boolean n = bound < 0;
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- Double d = biases.get(kind);
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- if(d == null)
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- return n ? rng.nextLong(-bound) * -1 : rng.nextLong(bound);
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- return (long)(quantile(d) * bound);
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- }
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-
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- /**
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- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
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- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
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- * expected average the kind was associated with. The returned number will be a double between 0.0 and 1.0
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- * (exclusive on 1.0). If the kind is not in the map, this generates a double using RNG and no further changes.
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- * @param kind the kind of bias to look up
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- * @return a random double between 0.0 and 1.0, potentially influenced by the bias associated with kind, if present
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- */
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- public double biasedDouble(String kind)
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- {
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- Double d = biases.get(kind);
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- if(d == null)
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- return rng.nextDouble();
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- return quantile(d);
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- }
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-
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- /**
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- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
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- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
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- * expected average the kind was associated with. The returned number will be a double between 0 and bound (exclusive
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- * on bound), where bound can be negative (the same as RNG). If the kind is not in the map, this doesn't adjust the
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- * average, and acts exactly like RNG.
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- * @param kind the kind of bias to look up
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- * @param bound the outer bound, exclusive; can be negative
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- * @return a random double between 0 and bound, potentially influenced by the bias associated with kind, if present
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- */
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- public double biasedDouble(String kind, double bound)
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- {
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- Double d = biases.get(kind);
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- if(d == null)
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- return rng.nextDouble(bound);
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- return quantile(d) * bound;
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- }
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-
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- /**
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- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
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- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
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- * expected average the kind was associated with. The returned number will be a positive int in either case. If the
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- * kind is not in the map, this generates a positive int, using 31 bits instead of RNG's normal 32 bits since it
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- * never generates negative numbers.
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- * @param kind the kind of bias to look up
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- * @return a random 31-bit positive int, potentially influenced by the bias associated with kind, if present
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- */
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- public int biasedInt(String kind)
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- {
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- Double d = biases.get(kind);
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- if(d == null)
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- return rng.nextInt() >>> 1;
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- return (int)(quantile(d) * Integer.MAX_VALUE);
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- }
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-
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- /**
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- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
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- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
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- * expected average the kind was associated with. The returned number will be an int between 0 and bound (exclusive
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- * on bound), where bound can be negative (and this behavior is allowed even though RNG normally returns 0 for all
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- * negative bounds). If the kind is not in the map, this generates an int between 0 and bound (exclusive on bound),
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- * even if bound is negative.
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- * @param kind the kind of bias to look up
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- * @param bound the outer bound, exclusive; can be negative
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- * @return a random int between 0 and bound, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public int biasedInt(String kind, int bound)
|
|
|
- {
|
|
|
- boolean n = bound < 0;
|
|
|
- Double d = biases.get(kind);
|
|
|
- if(d == null)
|
|
|
- return n ? rng.nextInt(-bound) * -1 : rng.nextInt(bound);
|
|
|
- return (int)(quantile(d) * bound);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
|
|
|
- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
|
|
|
- * expected average the kind was associated with. The returned number will be a float between 0.0 and 1.0
|
|
|
- * (exclusive on 1.0). If the kind is not in the map, this generates a float using RNG and no further changes.
|
|
|
- * @param kind the kind of bias to look up
|
|
|
- * @return a random float between 0.0 and 1.0, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public float biasedFloat(String kind)
|
|
|
- {
|
|
|
- Double d = biases.get(kind);
|
|
|
- if(d == null)
|
|
|
- return rng.nextFloat();
|
|
|
- return (float) quantile(d);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
|
|
|
- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
|
|
|
- * expected average the kind was associated with. The returned number will be a float between 0 and bound (exclusive
|
|
|
- * on bound), where bound can be negative. If the kind is not in the map, this doesn't adjust the average.
|
|
|
- * @param kind the kind of bias to look up
|
|
|
- * @param bound the outer bound, exclusive; can be negative
|
|
|
- * @return a random double between 0 and bound, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public float biasedFloat(String kind, float bound)
|
|
|
- {
|
|
|
- Double d = biases.get(kind);
|
|
|
- if(d == null)
|
|
|
- return rng.nextFloat() * bound;
|
|
|
- return (float)(quantile(d) * bound);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
|
|
|
- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
|
|
|
- * expected average the kind was associated with. The returned boolean will be true if the random number (between
|
|
|
- * 0.0 and 1.0, exclusive upper) is greater than or equal to 0.5. If the kind is not in the map, this generates a
|
|
|
- * boolean using RNG and no further changes.
|
|
|
- * @param kind the kind of bias to look up
|
|
|
- * @return a random float between 0.0 and 1.0, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public boolean biasedBoolean(String kind)
|
|
|
- {
|
|
|
- Double d = biases.get(kind);
|
|
|
- if(d == null)
|
|
|
- return rng.nextBoolean();
|
|
|
- return quantile(d) >= 0.5;
|
|
|
- }
|
|
|
- /**
|
|
|
- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
|
|
|
- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
|
|
|
- * expected average the kind was associated with. The returned number will be an int between min and max (exclusive
|
|
|
- * on max), where min and/or max can be negative, and the difference between the two can be either positive or
|
|
|
- * negative. If the kind is not in the map, this doesn't adjust the average.
|
|
|
- * @param kind the kind of bias to look up
|
|
|
- * @param min the inner bound, inclusive; can be negative
|
|
|
- * @param max the outer bound, exclusive; can be negative
|
|
|
- * @return a random int between min and max, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public int biasedBetween(String kind, int min, int max)
|
|
|
- {
|
|
|
- return biasedInt(kind, max - min) + min;
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
|
|
|
- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
|
|
|
- * expected average the kind was associated with. The returned number will be a long between min and max (exclusive
|
|
|
- * on max), where min and/or max can be negative, and the difference between the two can be either positive or
|
|
|
- * negative. If the kind is not in the map, this doesn't adjust the average.
|
|
|
- * @param kind the kind of bias to look up
|
|
|
- * @param min the inner bound, inclusive; can be negative
|
|
|
- * @param max the outer bound, exclusive; can be negative
|
|
|
- * @return a random long between min and max, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public long biasedBetween(String kind, long min, long max)
|
|
|
- {
|
|
|
- return biasedLong(kind, max - min) + min;
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Looks up the given kind in the Map of biases this stores, and generates a random number using this object's RNG.
|
|
|
- * If the kind is in the Map, this adjusts the generated number so it matches a distribution that would have the
|
|
|
- * expected average the kind was associated with. The returned number will be a double between min and max
|
|
|
- * (exclusive on max), where min and/or max can be negative, and the difference between the two can be either
|
|
|
- * positive or negative. If the kind is not in the map, this doesn't adjust the average.
|
|
|
- * @param kind the kind of bias to look up
|
|
|
- * @param min the inner bound, inclusive; can be negative
|
|
|
- * @param max the outer bound, exclusive; can be negative
|
|
|
- * @return a random double between min and max, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public double biasedBetween(String kind, double min, double max)
|
|
|
- {
|
|
|
- return biasedDouble(kind, max - min) + min;
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a positive long in either case, but
|
|
|
- * not all long values are possible if this is biased, in part because of generating a double, which has less
|
|
|
- * precision than long, and in part because some numbers need to be more common than others.
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @return a random 63-bit positive long, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public long biasedLong(double expectedAverage)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return (long)(quantile(expectedAverage) * Long.MAX_VALUE);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a long between 0 and bound (exclusive
|
|
|
- * on bound), where bound can be negative (and this behavior is allowed even though RNG normally returns 0 for all
|
|
|
- * negative bounds).
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @param bound the outer bound, exclusive; can be negative
|
|
|
- * @return a random long between 0 and bound, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public long biasedLong(double expectedAverage, long bound)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return (long)(quantile(expectedAverage) * bound);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a double between 0.0 and 1.0 (exclusive
|
|
|
- * on 1.0).
|
|
|
- * @param expectedAverage the desired average
|
|
|
- * @return a random double between 0.0 and 1.0, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public double biasedDouble(double expectedAverage)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return quantile(expectedAverage);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a double between 0 and bound (exclusive
|
|
|
- * on bound), where bound can be negative (the same as RNG).
|
|
|
- * @param expectedAverage the desired average
|
|
|
- * @param bound the outer bound, exclusive; can be negative
|
|
|
- * @return a random double between 0 and bound, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public double biasedDouble(double expectedAverage, double bound)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return quantile(expectedAverage) * bound;
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a positive int from 0 to (2 to the 31)-1
|
|
|
- * in either case.
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @return a random 31-bit positive int, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public int biasedInt(double expectedAverage)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return (int)(quantile(expectedAverage) * Integer.MAX_VALUE);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be an int between 0 and bound (exclusive
|
|
|
- * on bound), where bound can be negative (and this behavior is allowed even though RNG normally returns 0 for all
|
|
|
- * negative bounds).
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @param bound the outer bound, exclusive; can be negative
|
|
|
- * @return a random int between 0 and bound, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public int biasedInt(double expectedAverage, int bound)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return (int)(quantile(expectedAverage) * bound);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a float between 0.0f and 1.0f (exclusive
|
|
|
- * on 1.0f).
|
|
|
- * @param expectedAverage the desired average
|
|
|
- * @return a random float between 0.0 and 1.0, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public float biasedFloat(double expectedAverage)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return (float) quantile(expectedAverage);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a float between 0f and bound (exclusive
|
|
|
- * on bound), where bound can be negative.
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @param bound the outer bound, exclusive; can be negative
|
|
|
- * @return a random double between 0 and bound, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public float biasedFloat(double expectedAverage, float bound)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return (float)(quantile(expectedAverage) * bound);
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned boolean will be true if the random number (between 0.0
|
|
|
- * and 1.0, exclusive upper) is greater than or equal to 0.5.
|
|
|
- * @param expectedAverage the desired probability of a true result, between 0.0 and 1.0
|
|
|
- * @return a random float between 0.0 and 1.0, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public boolean biasedBoolean(double expectedAverage)
|
|
|
- {
|
|
|
- if(expectedAverage <= 0) expectedAverage = 0.001;
|
|
|
- if(expectedAverage >= 1) expectedAverage = 0.999;
|
|
|
- return quantile(expectedAverage) >= 0.5;
|
|
|
- }
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be an int between min and max (exclusive
|
|
|
- * on max), where min and/or max can be negative, and the difference between the two can be either positive or
|
|
|
- * negative.
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @param min the inner bound, inclusive; can be negative
|
|
|
- * @param max the outer bound, exclusive; can be negative
|
|
|
- * @return a random int between min and max, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public int biasedBetween(double expectedAverage, int min, int max)
|
|
|
- {
|
|
|
- return biasedInt(expectedAverage, max - min) + min;
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a long between min and max (exclusive
|
|
|
- * on max), where min and/or max can be negative, and the difference between the two can be either positive or
|
|
|
- * negative.
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @param min the inner bound, inclusive; can be negative
|
|
|
- * @param max the outer bound, exclusive; can be negative
|
|
|
- * @return a random long between min and max, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public long biasedBetween(double expectedAverage, long min, long max)
|
|
|
- {
|
|
|
- return biasedLong(expectedAverage, max - min) + min;
|
|
|
- }
|
|
|
-
|
|
|
- /**
|
|
|
- * Generates a random number using this object's RNG and adjusts the generated number so it matches a distribution
|
|
|
- * that would have the given expected average. The returned number will be a double between min and max (exclusive
|
|
|
- * on max), where min and/or max can be negative, and the difference between the two can be either positive or
|
|
|
- * negative.
|
|
|
- * @param expectedAverage the desired average if the minimum value was 0.0 and the exclusive max was 1.0
|
|
|
- * @param min the inner bound, inclusive; can be negative
|
|
|
- * @param max the outer bound, exclusive; can be negative
|
|
|
- * @return a random double between min and max, potentially influenced by the bias associated with kind, if present
|
|
|
- */
|
|
|
- public double biasedBetween(double expectedAverage, double min, double max)
|
|
|
- {
|
|
|
- return biasedDouble(expectedAverage, max - min) + min;
|
|
|
- }
|
|
|
-
|
|
|
- @Override
|
|
|
- public String toString() {
|
|
|
- return "RandomBias{" +
|
|
|
- "biases=" + biases +
|
|
|
- ", rng=" + rng +
|
|
|
- ", distribution=" + distribution +
|
|
|
- '}';
|
|
|
- }
|
|
|
-
|
|
|
-}
|