// Hyperbolic Arccosine
//
// acosh - inverse hyperbolic cosine
//
// y[t] = acosh( x[t] )       if x[t] >= 1
// y[t] = NAN                 if x[t] < 1
//
// X_n - 1
// Y_n - 1
// C_n - 0

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



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


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

int ts_acosh(
	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_acosh_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		fp_t v = x[0][i];
		y[0][i] = v >= 1.0 ? acosh( v ) : (fp_t)NAN;
	}
	return 0;
}