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

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;
+}
+