diff options
| author | Ethan Werner <mail@ethanwerner.com> | 2026-07-01 09:42:39 +0400 |
|---|---|---|
| committer | Ethan Werner <mail@ethanwerner.com> | 2026-07-01 09:42:39 +0400 |
| commit | 07e18043145f3d91c8ea7ec3ad41b3c905585277 (patch) | |
| tree | 2bdeae46973f4bdfce263679a4008ac768011f28 /lib/smoothstep.c | |
initial commit: ts time series analysis library v0.1.0
- 354 financial and mathematical time-series indicators
- Uniform C11 API with consistent function signatures
- 349 passing tests with -Werror
- Static and shared library builds
- pkg-config integration
- Python bindings
- Fuzzing and sanitizer support
- Security hardening flags
Diffstat (limited to 'lib/smoothstep.c')
| -rw-r--r-- | lib/smoothstep.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/lib/smoothstep.c b/lib/smoothstep.c new file mode 100644 index 0000000..224e68b --- /dev/null +++ b/lib/smoothstep.c @@ -0,0 +1,48 @@ +// Smoothstep +// +// smoothstep - Smoothstep interpolation +// +// y[t] = x[t] <= 0 ? 0 : x[t] >= 1 ? 1 : 3*x[t]^2 - 2*x[t]^3 +// +// X_n - 1 +// Y_n - 1 +// C_n - 0 + + +#include "ts.h" + + + +ts_parameter_t const ts_smoothstep_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 }; + + +uint_t ts_smoothstep_offset( ts_constant_t const *c ) +{ + ( void )c; + return ( 0 ); +} + +int ts_smoothstep( + 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_smoothstep_p ); + (void)c; + for( uint_t i = 0; i < n; ++i ) + { + fp_t xi = x[0][i]; + if ( xi <= 0 ) + y[0][i] = 0; + else if ( xi >= 1 ) + y[0][i] = 1; + else + { + fp_t x2 = xi * xi; + y[0][i] = 3 * x2 - 2 * x2 * xi; + } + } + return 0; +} + |