add numerical recipes library

lib/nr/ansi/recipes/qrsolv.c

@@ -0,0 +1,14 @@
+
+void qrsolv(float **a, int n, float c[], float d[], float b[])
+{
+	void rsolv(float **a, int n, float d[], float b[]);
+	int i,j;
+	float sum,tau;
+
+	for (j=1;j<n;j++) {
+		for (sum=0.0,i=j;i<=n;i++) sum += a[i][j]*b[i];
+		tau=sum/c[j];
+		for (i=j;i<=n;i++) b[i] -= tau*a[i][j];
+	}
+	rsolv(a,n,d,b);
+}