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Merge pull request #74248 from Chaosus/randfn_fix

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Fix randfn to prevent generating of nan values
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Rémi Verschelde 2023-03-05 13:24:20 +01:00
commit 2832ef434d
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1 changed files with 10 additions and 2 deletions
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12
core/math/random_pcg.h
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@ -126,10 +126,18 @@ public:
} }
_FORCE_INLINE_ double randfn(double p_mean, double p_deviation) { _FORCE_INLINE_ double randfn(double p_mean, double p_deviation) {
return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(randd()))); // Box-Muller transform double temp = randd();
if (temp < CMP_EPSILON) {
temp += CMP_EPSILON; // To prevent generating of INF value in log function, resulting to return NaN value from this function.
}
return p_mean + p_deviation * (cos(Math_TAU * randd()) * sqrt(-2.0 * log(temp))); // Box-Muller transform.
} }
_FORCE_INLINE_ float randfn(float p_mean, float p_deviation) { _FORCE_INLINE_ float randfn(float p_mean, float p_deviation) {
return p_mean + p_deviation * (cos((float)Math_TAU * randf()) * sqrt(-2.0 * log(randf()))); // Box-Muller transform float temp = randf();
if (temp < CMP_EPSILON) {
temp += CMP_EPSILON; // To prevent generating of INF value in log function, resulting to return NaN value from this function.
}
return p_mean + p_deviation * (cos((float)Math_TAU * randf()) * sqrt(-2.0 * log(temp))); // Box-Muller transform.
} }
double random(double p_from, double p_to); double random(double p_from, double p_to);