add numerical recipes library

lib/nr/ansi/recipes/red.c

@@ -0,0 +1,19 @@
+
+void red(int iz1, int iz2, int jz1, int jz2, int jm1, int jm2, int jmf,
+	int ic1, int jc1, int jcf, int kc, float ***c, float **s)
+{
+	int loff,l,j,ic,i;
+	float vx;
+
+	loff=jc1-jm1;
+	ic=ic1;
+	for (j=jz1;j<=jz2;j++) {
+		for (l=jm1;l<=jm2;l++) {
+			vx=c[ic][l+loff][kc];
+			for (i=iz1;i<=iz2;i++) s[i][l] -= s[i][j]*vx;
+		}
+		vx=c[ic][jcf][kc];
+		for (i=iz1;i<=iz2;i++) s[i][jmf] -= s[i][j]*vx;
+		ic += 1;
+	}
+}