// 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;
}