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Diffstat (limited to 'lib/secant_hyperbolic_inverse.c')
| -rw-r--r-- | lib/secant_hyperbolic_inverse.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/secant_hyperbolic_inverse.c b/lib/secant_hyperbolic_inverse.c new file mode 100644 index 0000000..d530d71 --- /dev/null +++ b/lib/secant_hyperbolic_inverse.c @@ -0,0 +1,42 @@ +// Inverse Hyperbolic Secant +// +// secant_hyperbolic_inverse - asech +// +// f( x ) = asech( x ) +// = ln( ( 1 / x ) + √( ( 1 / x^2 ) - 1 ) ) 0 < x ≤ 1 +// +// X_n - 1 +// Y_n - 1 +// C_n - 0 + + +#include <math.h> +#include "ts.h" + + + +ts_parameter_t const ts_secant_hyperbolic_inverse_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 }; + + +uint_t ts_secant_hyperbolic_inverse_offset( ts_constant_t const *c ) +{ + ( void )c; + return ( 0 ); +} + +int ts_secant_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_secant_hyperbolic_inverse_p ); + (void)c; + for( uint_t i = 0; i < n; ++i ) + { + fp_t xi = x[0][i]; + y[0][i] = ( xi > 0 && xi <= 1.0 ) ? acosh( _ts_reciprocal( xi ) ) : 0; + } + return 0; +} + |