39 lines
942 B
C
39 lines
942 B
C
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#include <math.h>
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#include "nrutil.h"
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void ks2d2s(x1,y1,n1,x2,y2,n2,d,prob)
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float *d,*prob,x1[],x2[],y1[],y2[];
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unsigned long n1,n2;
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{
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float probks();
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void pearsn(),quadct();
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unsigned long j;
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float d1,d2,dum,dumm,fa,fb,fc,fd,ga,gb,gc,gd,r1,r2,rr,sqen;
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d1=0.0;
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for (j=1;j<=n1;j++) {
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quadct(x1[j],y1[j],x1,y1,n1,&fa,&fb,&fc,&fd);
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quadct(x1[j],y1[j],x2,y2,n2,&ga,&gb,&gc,&gd);
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d1=FMAX(d1,fabs(fa-ga));
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d1=FMAX(d1,fabs(fb-gb));
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d1=FMAX(d1,fabs(fc-gc));
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d1=FMAX(d1,fabs(fd-gd));
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}
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d2=0.0;
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for (j=1;j<=n2;j++) {
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quadct(x2[j],y2[j],x1,y1,n1,&fa,&fb,&fc,&fd);
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quadct(x2[j],y2[j],x2,y2,n2,&ga,&gb,&gc,&gd);
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d2=FMAX(d2,fabs(fa-ga));
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d2=FMAX(d2,fabs(fb-gb));
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d2=FMAX(d2,fabs(fc-gc));
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d2=FMAX(d2,fabs(fd-gd));
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}
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*d=0.5*(d1+d2);
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sqen=sqrt(n1*n2/(double)(n1+n2));
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pearsn(x1,y1,n1,&r1,&dum,&dumm);
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pearsn(x2,y2,n2,&r2,&dum,&dumm);
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rr=sqrt(1.0-0.5*(r1*r1+r2*r2));
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*prob=probks(*d*sqen/(1.0+rr*(0.25-0.75/sqen)));
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}
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