47 lines
876 B
C
47 lines
876 B
C
|
|
#include <math.h>
|
|
#include "nrutil.h"
|
|
|
|
void memcof(data,n,m,xms,d)
|
|
float *xms,d[],data[];
|
|
int m,n;
|
|
{
|
|
int k,j,i;
|
|
float p=0.0,*wk1,*wk2,*wkm;
|
|
|
|
wk1=vector(1,n);
|
|
wk2=vector(1,n);
|
|
wkm=vector(1,m);
|
|
for (j=1;j<=n;j++) p += SQR(data[j]);
|
|
*xms=p/n;
|
|
wk1[1]=data[1];
|
|
wk2[n-1]=data[n];
|
|
for (j=2;j<=n-1;j++) {
|
|
wk1[j]=data[j];
|
|
wk2[j-1]=data[j];
|
|
}
|
|
for (k=1;k<=m;k++) {
|
|
float num=0.0,denom=0.0;
|
|
for (j=1;j<=(n-k);j++) {
|
|
num += wk1[j]*wk2[j];
|
|
denom += SQR(wk1[j])+SQR(wk2[j]);
|
|
}
|
|
d[k]=2.0*num/denom;
|
|
*xms *= (1.0-SQR(d[k]));
|
|
for (i=1;i<=(k-1);i++)
|
|
d[i]=wkm[i]-d[k]*wkm[k-i];
|
|
if (k == m) {
|
|
free_vector(wkm,1,m);
|
|
free_vector(wk2,1,n);
|
|
free_vector(wk1,1,n);
|
|
return;
|
|
}
|
|
for (i=1;i<=k;i++) wkm[i]=d[i];
|
|
for (j=1;j<=(n-k-1);j++) {
|
|
wk1[j] -= wkm[k]*wk2[j];
|
|
wk2[j]=wk2[j+1]-wkm[k]*wk1[j+1];
|
|
}
|
|
}
|
|
nrerror("never get here in memcof.");
|
|
}
|