add numerical recipes library

lib/nr/ansi/recipes/poldiv.c

@@ -0,0 +1,15 @@
+
+void poldiv(float u[], int n, float v[], int nv, float q[], float r[])
+{
+	int k,j;
+
+	for (j=0;j<=n;j++) {
+		r[j]=u[j];
+		q[j]=0.0;
+	}
+	for (k=n-nv;k>=0;k--) {
+		q[k]=r[nv+k]/v[nv];
+		for (j=nv+k-1;j>=k;j--) r[j] -= q[k]*v[j-k];
+	}
+	for (j=nv;j<=n;j++) r[j]=0.0;
+}