squiggle.c/examples/13_ergonomic_algebra/example.c

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#include "../../squiggle.h"
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#define ln lognormal_params
#define to(...) convert_ci_to_lognormal_params((ci) __VA_ARGS__)
#define from(...) convert_lognormal_params_to_ci((ln) __VA_ARGS__)
#define times(a,b) algebra_product_lognormals(a,b)
int main()
{
// set randomness seed
uint64_t* seed = malloc(sizeof(uint64_t));
*seed = 1000; // xorshift can't start with 0
ln a = to({.low = 1, .high = 10});
ln b = to({.low = 5, .high = 500});
ln c = times(a, b);
printf("Result: to(%f, %f)\n", from(c).low, from(c).high);
printf("One sample from it is: %f\n", sample_lognormal(c.logmean, c.logstd, seed));
free(seed);
}