forked from personal/squiggle.c
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
#include "../squiggle.h"
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#include <stdint.h>
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define N 1000 * 1000
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void test_unit_uniform(uint64_t* seed){
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float* unit_uniform_array = malloc(sizeof(float) * N);
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for(int i=0; i<N; i++){
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unit_uniform_array[i] = sample_unit_uniform(seed);
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}
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float mean = array_mean(unit_uniform_array, N);
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float expected_mean = 0.5;
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float delta_mean = mean - expected_mean;
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float std = array_std(unit_uniform_array, N);
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float expected_std = sqrt(1.0/12.0);
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float delta_std = std - expected_std;
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printf("Mean of unit uniform: %f, vs expected mean: %f, delta: %f\n", mean, expected_mean, delta_mean);
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printf("Std of unit uniform: %f, vs expected std: %f, delta: %f\n", std, expected_std, delta_std);
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if(fabs(delta_mean) > 1.0/1000.0){
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printf("[-] Mean test for unit uniform NOT passed.\n");
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}else {
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printf("[x] Mean test for unit uniform PASSED\n");
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}
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if(fabs(delta_std) > 1.0/1000.0){
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printf("[-] Std test for unit uniform NOT passed.\n");
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}else {
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printf("[x] Std test for unit uniform PASSED\n");
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}
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printf("\n");
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}
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void test_uniform(float start, float end, uint64_t* seed){
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float* uniform_array = malloc(sizeof(float) * N);
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for(int i=0; i<N; i++){
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uniform_array[i] = sample_uniform(start, end, seed);
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}
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float mean = array_mean(uniform_array, N);
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float expected_mean = (start + end) / 2;
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float delta_mean = mean - expected_mean;
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float std = array_std(uniform_array, N);
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float expected_std = sqrt(1.0/12.0) * fabs(end-start);
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float delta_std = std - expected_std;
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float width = fabs(end - start);
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if(fabs(delta_mean) > width * 1.0/1000.0){
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printf("[-] Mean test for [%.1f, %.1f] uniform NOT passed.\n", start, end);
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printf("Mean of [%.1f, %.1f] uniform: %f, vs expected mean: %f, delta: %f\n", start, end, mean, expected_mean, mean - expected_mean);
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}else {
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printf("[x] Mean test for unit uniform PASSED\n");
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}
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if(fabs(delta_std) > width * 1.0/1000.0){
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printf("[-] Std test for [%.1f, %.1f] uniform NOT passed.\n", start, end);
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printf("Std of [%.1f, %.1f] uniform: %f, vs expected std: %f, delta: %f\n", start, end, std, expected_std, std - expected_std);
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}else {
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printf("[x] Std test for unit uniform PASSED\n");
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}
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printf("\n");
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}
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int main(){
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// set randomness seed
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uint64_t* seed = malloc(sizeof(uint64_t));
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*seed = 1000; // xorshift can't start with a seed of 0
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test_unit_uniform(seed);
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for(int i=0; i<100; i++){
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float start = sample_uniform(-10, 10, seed);
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float end = sample_uniform(-10, 10, seed);
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if ( end > start){
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test_uniform(start, end, seed);
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}
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}
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free(seed);
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}
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