44 lines
790 B
C
44 lines
790 B
C
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#include <math.h>
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#include "complex.h"
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#include "nrutil.h"
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#define EPS 1.0e-6
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fcomplex aa,bb,cc,z0,dz;
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int kmax,kount;
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float *xp,**yp,dxsav;
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fcomplex hypgeo(a,b,c,z)
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fcomplex a,b,c,z;
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{
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void bsstep(),hypdrv(),hypser(),odeint();
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int nbad,nok;
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fcomplex ans,y[3];
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float *yy;
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kmax=0;
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if (z.r*z.r+z.i*z.i <= 0.25) {
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hypser(a,b,c,z,&ans,&y[2]);
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return ans;
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}
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else if (z.r < 0.0) z0=Complex(-0.5,0.0);
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else if (z.r <= 1.0) z0=Complex(0.5,0.0);
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else z0=Complex(0.0,z.i >= 0.0 ? 0.5 : -0.5);
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aa=a;
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bb=b;
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cc=c;
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dz=Csub(z,z0);
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hypser(aa,bb,cc,z0,&y[1],&y[2]);
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yy=vector(1,4);
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yy[1]=y[1].r;
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yy[2]=y[1].i;
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yy[3]=y[2].r;
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yy[4]=y[2].i;
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odeint(yy,4,0.0,1.0,EPS,0.1,0.0001,&nok,&nbad,hypdrv,bsstep);
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y[1]=Complex(yy[1],yy[2]);
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free_vector(yy,1,4);
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return y[1];
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}
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#undef EPS
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