lib/log1p.c


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// Log1p
//
// log1p
//
// Log(1+x)
//
// ln(1+x), accurate for small x
//
// Inputs:    1
// Outputs:   1
// Constants: 0


#include <math.h>
#include "ts.h"

ts_parameter_t const ts_log1p_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };

uint_t ts_log1p_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 0 );
}

int ts_log1p(
	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_log1p_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		fp_t xv = x[0][i];
		if( xv < -1.0 ) { y[0][i] = 0; continue; }
		y[0][i] = log1p( xv );
	}
	return 0;
}