diff options
Diffstat (limited to 'lib/log1p.c')
| -rw-r--r-- | lib/log1p.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/log1p.c b/lib/log1p.c new file mode 100644 index 0000000..dc49223 --- /dev/null +++ b/lib/log1p.c @@ -0,0 +1,41 @@ +// 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; +} + |