From 07e18043145f3d91c8ea7ec3ad41b3c905585277 Mon Sep 17 00:00:00 2001 From: Ethan Werner Date: Wed, 1 Jul 2026 09:42:39 +0400 Subject: 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 --- lib/volatility_system.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 lib/volatility_system.c (limited to 'lib/volatility_system.c') diff --git a/lib/volatility_system.c b/lib/volatility_system.c new file mode 100644 index 0000000..dbb74d1 --- /dev/null +++ b/lib/volatility_system.c @@ -0,0 +1,55 @@ +// Volatility System +// +// volatility_system +// +// Volatility System +// +// +// +// Inputs: 4 +// Outputs: 1 +// Constants: 1 + + +#include +#include "ts.h" + +typedef struct { + uint_t k; +} ts_volatility_system_params_t; + +ts_parameter_t const ts_volatility_system_p = { .n_inputs = 4, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_volatility_system_params_t) }; + +uint_t ts_volatility_system_offset( ts_constant_t const *c ) +{ + ( void )c; + return ( c ? 2 * ((ts_volatility_system_params_t *)c)->k : 0 ); +} + +int ts_volatility_system( + 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_volatility_system_p ); + if ( !c ) return -1; + uint_t k = ((ts_volatility_system_params_t *)c)->k; + if (k == 0 || n < k) return -1; + + uint_t range_period = 2 * k; + if (n < range_period) return -1; + + fp_t ema = (ts_c(x, range_period - 2) + ts_c(x, range_period - 1)) / 2.0; + + for( uint_t i = range_period; i < n; ++i ) + { + if( i == range_period ) + ema = (ts_c(x, i-1) + ts_c(x, i)) / 2.0; + else + ema = ema * 0.5 + ts_c(x, i) * 0.5; + y[0][i] = ema; + } + return 0; +} + -- cgit v1.3.1