48 lines
932 B
C
48 lines
932 B
C
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void sprspm(sa,ija,sb,ijb,sc,ijc)
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float sa[],sb[],sc[];
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unsigned long ija[],ijb[],ijc[];
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{
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void nrerror();
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unsigned long i,ijma,ijmb,j,m,ma,mb,mbb,mn;
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float sum;
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if (ija[1] != ijb[1] || ija[1] != ijc[1])
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nrerror("sprspm: sizes do not match");
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for (i=1;i<=ijc[1]-2;i++) {
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j=m=i;
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mn=ijc[i];
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sum=sa[i]*sb[i];
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for (;;) {
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mb=ijb[j];
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for (ma=ija[i];ma<=ija[i+1]-1;ma++) {
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ijma=ija[ma];
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if (ijma == j) sum += sa[ma]*sb[j];
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else {
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while (mb < ijb[j+1]) {
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ijmb=ijb[mb];
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if (ijmb == i) {
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sum += sa[i]*sb[mb++];
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continue;
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} else if (ijmb < ijma) {
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mb++;
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continue;
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} else if (ijmb == ijma) {
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sum += sa[ma]*sb[mb++];
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continue;
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}
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break;
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}
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}
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}
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for (mbb=mb;mbb<=ijb[j+1]-1;mbb++) {
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if (ijb[mbb] == i) sum += sa[i]*sb[mbb];
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}
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sc[m]=sum;
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sum=0.0;
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if (mn >= ijc[i+1]) break;
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j=ijc[m=mn++];
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}
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}
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}
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