add numerical recipes library

2025-09-12 18:55:25 +09:00
parent d4dff245bd
commit 2c75620ec9
1344 changed files with 63869 additions and 0 deletions
--- a/lib/nr/cpp/recipes/erff.cpp
+++ b/lib/nr/cpp/recipes/erff.cpp
@@ -0,0 +1,6 @@
+#include "nr.h"
+
+DP NR::erff(const DP x)
+{
+	return x < 0.0 ? -gammp(0.5,x*x) : gammp(0.5,x*x);
+}