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// Lgamma
//
// lgamma
//
// Natural log of gamma function
//
// ln(|Γ(x)|)
//
// Inputs: 1
// Outputs: 1
// Constants: 0
#include <math.h>
#include "ts.h"
ts_parameter_t const ts_lgamma_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };
uint_t ts_lgamma_offset( ts_constant_t const *c )
{
( void )c;
return ( 0 );
}
int ts_lgamma(
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_lgamma_p );
(void)c;
for( uint_t i = 0; i < n; ++i )
{
fp_t xv = x[0][i];
if( xv <= 0.0 )
{
fp_t intpart;
if (modf(xv, &intpart) != 0.0)
y[0][i] = lgamma(xv);
else
y[0][i] = NAN;
}
else
y[0][i] = lgamma( xv );
}
return 0;
}
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