From 07e18043145f3d91c8ea7ec3ad41b3c905585277 Mon Sep 17 00:00:00 2001
From: Ethan Werner <mail@ethanwerner.com>
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/is_prime.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 lib/is_prime.c

(limited to 'lib/is_prime.c')

diff --git a/lib/is_prime.c b/lib/is_prime.c
new file mode 100644
index 0000000..119c9a4
--- /dev/null
+++ b/lib/is_prime.c
@@ -0,0 +1,69 @@
+// Is Prime
+//
+// is_prime
+//
+// Prime number test
+//
+// 1 if prime, 0 otherwise
+//
+// Inputs:    1
+// Outputs:   1
+// Constants: 0
+
+
+#include <math.h>
+#include "ts.h"
+
+
+ts_parameter_t const ts_is_prime_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };
+
+uint_t ts_is_prime_offset( ts_constant_t const *c )
+{
+	( void )c;
+	return ( 0 );
+}
+
+int ts_is_prime(
+	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_is_prime_p );
+	(void)c;
+    for( uint_t i = 0; i < n; ++i )
+    {
+        fp_t v = x[0][i];
+        if (v > 1e15 || v < -1e15) { y[0][i] = 0.0; continue; }
+        long n_val = (long)v;
+        if( n_val < 2 )
+        {
+            y[0][i] = 0.0;
+            continue;
+        }
+        if( n_val == 2 )
+        {
+            y[0][i] = 1.0;
+            continue;
+        }
+        if( n_val % 2 == 0 )
+        {
+            y[0][i] = 0.0;
+            continue;
+        }
+        int prime = 1;
+        for( long d = 3; d <= n_val / d; d += 2 )
+        {
+            if( n_val % d == 0 )
+            {
+                prime = 0;
+                break;
+            }
+        }
+        y[0][i] = prime ? 1.0 : 0.0;
+    }
+	return 0;
+}
+
+
+
-- 
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