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authorEthan Werner <mail@ethanwerner.com>2026-07-01 09:42:39 +0400
committerEthan Werner <mail@ethanwerner.com>2026-07-01 09:42:39 +0400
commit07e18043145f3d91c8ea7ec3ad41b3c905585277 (patch)
tree2bdeae46973f4bdfce263679a4008ac768011f28 /lib/factorial.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/factorial.c')
-rw-r--r--lib/factorial.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/factorial.c b/lib/factorial.c
new file mode 100644
index 0000000..8e64fa3
--- /dev/null
+++ b/lib/factorial.c
@@ -0,0 +1,47 @@
+// Factorial
+//
+// factorial - n!
+//
+// n! = 1 * 2 * ... * n, capped at 170!
+//
+// Inputs: 1 (n)
+// Outputs: 1 (n!)
+// Constants: 0
+
+#include "ts.h"
+
+
+
+ts_parameter_t const ts_factorial_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };
+
+
+uint_t ts_factorial_offset( ts_constant_t const *c )
+{
+ ( void )c;
+ return ( 0 );
+}
+
+int ts_factorial(
+ 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_factorial_p );
+ (void)c;
+ for( uint_t i = 0; i < n; ++i )
+ {
+ if (x[0][i] < 0) { y[0][i] = NAN; continue; }
+ fp_t result = 1.0;
+ uint_t k = (uint_t)x[0][i];
+ if (k > 170) k = 170;
+ for( uint_t j = 1; j <= k; ++j )
+ {
+ result *= (fp_t)j;
+ }
+ y[0][i] = result;
+ }
+ return 0;
+}
+
+