Created
August 26, 2020 21:55
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running-average.c
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#include <stdint.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
struct running_average { | |
float average; | |
uint32_t count; | |
} typedef running_average; | |
void initialize(running_average* ra) { | |
ra->average = 0; | |
ra->count = 0; | |
} | |
void update(running_average* ra, const uint32_t x) { | |
if (ra->count == 0) { | |
ra->average = x; | |
ra->count = 1; | |
return; | |
} | |
ra->count += 1; | |
float a = (float)x / (float)ra->count; | |
float b = ra->average + a; | |
ra->average = b - (ra->average / (float)ra->count); | |
} | |
int main(int argc, char** argv) { | |
running_average ra; | |
initialize(&ra); | |
// for (int i = 0; i < 1000; i += 1) { | |
// uint32_t x = arc4random(); | |
printf("%zu\n", sizeof(float)); | |
// update(&ra, x); | |
update(&ra, 0xffffffff); | |
printf("x = %u, %f\n", 0xffffffff, ra.average); | |
update(&ra, 0xffffffff); | |
printf("x = %u, %f\n", 0xffffffff, ra.average); | |
update(&ra, 0xffffffff); | |
printf("x = %u, %f\n", 0xffffffff, ra.average); | |
update(&ra, 1); | |
printf("x = %u, %f\n", 1, ra.average); | |
update(&ra, 0x0fffffff); | |
printf("x = %u, %f\n", 0x0fffffff, ra.average); | |
update(&ra, 0xffffffff); | |
printf("x = %u, %f\n", 0xffffffff, ra.average); | |
// printf("x = %u, new average = %f\n", x, ra.average); | |
// } | |
} |
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