add numerical recipes library

lib/nr/k_and_r/recipes/svbksb.c

@@ -0,0 +1,26 @@
+
+#include "nrutil.h"
+
+void svbksb(u,w,v,m,n,b,x)
+float **u,**v,b[],w[],x[];
+int m,n;
+{
+	int jj,j,i;
+	float s,*tmp;
+
+	tmp=vector(1,n);
+	for (j=1;j<=n;j++) {
+		s=0.0;
+		if (w[j]) {
+			for (i=1;i<=m;i++) s += u[i][j]*b[i];
+			s /= w[j];
+		}
+		tmp[j]=s;
+	}
+	for (j=1;j<=n;j++) {
+		s=0.0;
+		for (jj=1;jj<=n;jj++) s += v[j][jj]*tmp[jj];
+		x[j]=s;
+	}
+	free_vector(tmp,1,n);
+}