lib/cosecant_hyperbolic_inverse.c


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// Inverse Hyperbolic Cosecant
//
// cosecant_hyperbolic_inverse - acsch
//
// f( x ) = acsch( x )
//        = ln( ( 1 / x ) + √( ( 1 / x^2 ) + 1 ) )    x ≠ 0
//
// X_n - 1
// Y_n - 1
// C_n - 0


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


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


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

int ts_cosecant_hyperbolic_inverse(
	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_cosecant_hyperbolic_inverse_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		fp_t xv = x[0][i];
		y[0][i] = xv == 0.0 ? (fp_t)NAN : asinh( _ts_reciprocal( xv ) );
	}
	return 0;
}