add numerical recipes library

lib/nr/ansi/recipes/hypdrv.c

@@ -0,0 +1,23 @@
+
+#include "complex.h"
+#define ONE Complex(1.0,0.0)
+
+extern fcomplex aa,bb,cc,z0,dz;
+
+void hypdrv(float s, float yy[], float dyyds[])
+{
+	fcomplex z,y[3],dyds[3];
+
+	y[1]=Complex(yy[1],yy[2]);
+	y[2]=Complex(yy[3],yy[4]);
+	z=Cadd(z0,RCmul(s,dz));
+	dyds[1]=Cmul(y[2],dz);
+	dyds[2]=Cmul(Csub(Cmul(Cmul(aa,bb),y[1]),Cmul(Csub(cc,
+		Cmul(Cadd(Cadd(aa,bb),ONE),z)),y[2])),
+		Cdiv(dz,Cmul(z,Csub(ONE,z))));
+	dyyds[1]=dyds[1].r;
+	dyyds[2]=dyds[1].i;
+	dyyds[3]=dyds[2].r;
+	dyyds[4]=dyds[2].i;
+}
+#undef ONE