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// 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;
}
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