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/ansi/recipes/sprstx.c
+++ b/lib/nr/ansi/recipes/sprstx.c
@@ -0,0 +1,16 @@
+
+void sprstx(float sa[], unsigned long ija[], float x[], float b[],
+	unsigned long n)
+{
+	void nrerror(char error_text[]);
+	unsigned long i,j,k;
+
+	if (ija[1] != n+2) nrerror("mismatched vector and matrix in sprstx");
+	for (i=1;i<=n;i++) b[i]=sa[i]*x[i];
+	for (i=1;i<=n;i++) {
+		for (k=ija[i];k<=ija[i+1]-1;k++) {
+			j=ija[k];
+			b[j] += sa[k]*x[i];
+		}
+	}
+}