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add efficient beta distribution

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NunoSempere 2023-07-22 22:24:22 +02:00
parent 3f70915903
commit 4dad518d3f
1 changed files with 7 additions and 0 deletions
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squiggle.c
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@ -4,6 +4,7 @@
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <sys/types.h>
#include <time.h> #include <time.h>
#define MAX_ERROR_LENGTH 500 #define MAX_ERROR_LENGTH 500
@ -109,6 +110,12 @@ float sample_gamma(float alpha, uint32_t* seed){
} }
} }
float sample_beta(float a, float b, uint32_t* seed){
float gamma_a = sample_gamma(a, seed);
float gamma_b = sample_gamma(b, seed);
return a / (a + b);
}
// Array helpers // Array helpers
float array_sum(float* array, int length) float array_sum(float* array, int length)
{ {