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// Factorial
//
// factorial - n!
//
// n! = 1 * 2 * ... * n, capped at 170!
//
// Inputs: 1 (n)
// Outputs: 1 (n!)
// Constants: 0
#include <math.h>
#include "ts.h"
ts_parameter_t const ts_factorial_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };
uint_t ts_factorial_offset( ts_constant_t const *c )
{
( void )c;
return ( 0 );
}
int ts_factorial(
fp_t * const *y, uint_t y_n,
fp_t const * const *x, uint_t x_n,
uint_t n, ts_constant_t const *c
)
{
TS_PROLOGUE( ts_factorial_p );
(void)c;
for( uint_t i = 0; i < n; ++i )
{
if (isnan(x[0][i]) || isinf(x[0][i]) || x[0][i] < 0) { y[0][i] = NAN; continue; }
fp_t result = 1.0;
uint_t k = (uint_t)x[0][i];
if (k > 170) k = 170;
for( uint_t j = 1; j <= k; ++j )
{
result *= (fp_t)j;
}
y[0][i] = result;
}
return 0;
}
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