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ll550

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livelong
2Â¥2014-06-17 17:27:14
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derek888

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#include "stdlib.h"
#include "rfft.c"
#include "irfft.c"


int m,n,len;  //mºÍn·Ö±ð´æ·ÅÁ½¸öÐòÁ㤶È
double x[],y[]; //Á½¸öÐòÁÐ,¼ÆËãÍê±ÏºóxÖдæ·ÅÏßÐÔÏà¹ØµÄÖµ

void correl(x,y,m,n,len)
{
        int i,len2;
        double t,*z;
        z=malloc(len*sizeof(double));
        for(i=m;i<len;i++)
        {
                x=0.0;
        }
        for(i=0;i<(m-1);i++)
        {
                z=0.0;
        }
        for(i=(m-1);i<=(m+n-2);i++)
        {
                z=y[i-m+1];
        }
        for(i=(m+n-1);i<len;i++)
        {
                z=0.0;
        }
        rfft(x,len);
        rfft(z,len);
        len2=len/2;
        x[0]=x[0]*z[0];
        x[len2]=x[len2]*z[len2];
        for(i=1;i<len2;i++)
        {
                t=x*z+x[len-i]*z[len-i];
                x[len-i]=x*z[len-i]-x[len-i]*z;
                x=t;
        }
        irfft(x,len);
        free(z);
}
Hardworkistheonlywaytosuccess!
3Â¥2014-06-20 13:20:51
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