formatting pass

This commit is contained in:
NunoSempere 2023-07-16 12:09:58 +02:00
parent 4deb2044d6
commit 5ef5c6847a

View File

@ -1,9 +1,9 @@
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <float.h> // FLT_MAX, FLT_MIN
#include <limits.h> // INT_MAX
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#define VERBOSE 1
// Errors
@ -22,7 +22,8 @@ struct box {
};
// Example cdf
float cdf_uniform_0_1(float x){
float cdf_uniform_0_1(float x)
{
if (x < 0) {
return 0;
} else if (x > 1) {
@ -32,7 +33,8 @@ float cdf_uniform_0_1(float x){
}
}
float cdf_squared_0_1(float x){
float cdf_squared_0_1(float x)
{
if (x < 0) {
return 0;
} else if (x > 1) {
@ -42,14 +44,16 @@ float cdf_squared_0_1(float x){
}
}
float cdf_normal_0_1(float x){
float cdf_normal_0_1(float x)
{
float mean = 0;
float std = 1;
return 0.5 * (1 + erf((x - mean) / (std * sqrt(2))));
}
// Inverse cdf
struct box inverse_cdf(float cdf(float), float p){
struct box inverse_cdf(float cdf(float), float p)
{
// given a cdf: [-Inf, Inf] => [0,1]
// returns x such that cdf(x) = p
// to do: add bounds, add error checking
@ -113,7 +117,6 @@ struct box inverse_cdf(float cdf(float), float p){
high = mid;
}
}
}
if (convergence_condition) {
@ -125,12 +128,10 @@ struct box inverse_cdf(float cdf(float), float p){
return result;
}
}
// Get random number between 0 and 1
uint32_t xorshift32
(uint32_t* seed)
uint32_t xorshift32(uint32_t* seed)
{
// Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs"
// See <https://stackoverflow.com/questions/53886131/how-does-xorshift32-works>
@ -146,12 +147,14 @@ uint32_t xorshift32
// Distribution & sampling functions
float rand_0_to_1(uint32_t* seed){
float rand_0_to_1(uint32_t* seed)
{
return ((float)xorshift32(seed)) / ((float)UINT32_MAX);
}
// sampler based on inverse cdf
struct box sampler(float cdf(float), uint32_t* seed){
struct box sampler(float cdf(float), uint32_t* seed)
{
struct box result;
float p = rand_0_to_1(seed);
result = inverse_cdf(cdf, p);
@ -164,7 +167,8 @@ struct box sampler(float cdf(float), uint32_t* seed){
// <https://github.com/codeplea/incbeta>
// main with an example
int main(){
int main()
{
// Uniform:
struct box result_1 = inverse_cdf(cdf_uniform_0_1, 0.5);