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| 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/zeta.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/zeta.c')
| -rw-r--r-- | lib/zeta.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/zeta.c b/lib/zeta.c new file mode 100644 index 0000000..7b32e77 --- /dev/null +++ b/lib/zeta.c @@ -0,0 +1,52 @@ +// Zeta +// +// zeta +// +// Riemann Zeta Function +// +// +// +// Inputs: 1 +// Outputs: 1 +// Constants: 0 + + +#include <math.h> +#include "ts.h" + + + +ts_parameter_t const ts_zeta_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 }; + + +uint_t ts_zeta_offset( ts_constant_t const *c ) +{ + ( void )c; + return ( 0 ); +} + +int ts_zeta( + 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_zeta_p ); + (void)c; + for( uint_t i = 0; i < n; ++i ) + { + fp_t s = x[0][i]; + if( s <= 1.0 ) { y[0][i] = 0; continue; } + fp_t sum = 0.0; + fp_t term = 0.0; + for( uint_t k = 1; k <= 100000; ++k ) + { + term = 1.0 / pow( (fp_t)k, s ); + sum += term; + if( term < 1e-12 && k > 1000 ) break; + } + y[0][i] = sum; + } + return 0; +} + |