28 lines
491 B
C
28 lines
491 B
C
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#define SWAP(a,b) {dum=(a);(a)=(b);(b)=dum;}
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void banbks(float **a, unsigned long n, int m1, int m2, float **al,
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unsigned long indx[], float b[])
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{
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unsigned long i,k,l;
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int mm;
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float dum;
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mm=m1+m2+1;
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l=m1;
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for (k=1;k<=n;k++) {
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i=indx[k];
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if (i != k) SWAP(b[k],b[i])
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if (l < n) l++;
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for (i=k+1;i<=l;i++) b[i] -= al[k][i-k]*b[k];
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}
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l=1;
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for (i=n;i>=1;i--) {
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dum=b[i];
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for (k=2;k<=l;k++) dum -= a[i][k]*b[k+i-1];
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b[i]=dum/a[i][1];
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if (l < mm) l++;
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}
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}
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#undef SWAP
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