1 files changed, 50 insertions, 0 deletions
diff --git a/lib/harmonic.c b/lib/harmonic.c
new file mode 100644
index 0000000..2c69ee8
--- /dev/null
+++ b/lib/harmonic.c
@@ -0,0 +1,50 @@
+// Harmonic
+//
+// harmonic
+//
+// Harmonic mean
+//
+// H = n / Σ(1/x_i)
+//
+// Inputs:    1
+// Outputs:   1
+// Constants: 0
+
+
+#include <math.h>
+#include "ts.h"
+
+
+ts_parameter_t const ts_harmonic_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };
+
+uint_t ts_harmonic_offset( ts_constant_t const *c )
+{
+	( void )c;
+	return ( 0 );
+}
+
+int ts_harmonic(
+	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_harmonic_p );
+	(void)c;
+    for( uint_t i = 0; i < n; ++i )
+    {
+        if (x[0][i] < 0) { y[0][i] = NAN; continue; }
+        uint_t n_val = (uint_t)x[0][i];
+        if (n_val > 10000000) n_val = 10000000;
+        fp_t sum = 0.0;
+        for( uint_t k = 1; k <= n_val; ++k )
+        {
+            sum += 1.0 / (fp_t)k;
+        }
+        y[0][i] = sum;
+    }
+	return 0;
+}
+
+
+