54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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/* Driver for routine sprsin */
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#include <stdio.h>
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#define NRANSI
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#include "nr.h"
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#include "nrutil.h"
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#define NP 5
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#define NMAX (2*NP*NP+1)
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int main(void)
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{
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unsigned long i,j,msize,*ija;
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float **a,**aa,*sa;
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static float ainit[NP][NP]={
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3.0,0.0,1.0,0.0,0.0,
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0.0,4.0,0.0,0.0,0.0,
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0.0,7.0,5.0,9.0,0.0,
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0.0,0.0,0.0,0.0,2.0,
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0.0,0.0,0.0,6.0,5.0};
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ija=lvector(1,NMAX);
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sa=vector(1,NMAX);
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aa=matrix(1,NP,1,NP);
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a=convert_matrix(&ainit[0][0],1,NP,1,NP);
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sprsin(a,NP,0.5,NMAX,sa,ija);
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msize=ija[ija[1]-1]-1;
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sa[NP+1]=0.0;
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printf("index\tija\t\tsa\n");
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for (i=1;i<=msize;i++) printf("%lu\t%lu\t%12.6f\n",i,ija[i],sa[i]);
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for (i=1;i<=NP;i++) for (j=1;j<=NP;j++) aa[i][j]=0.0;
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for (i=1;i<=NP;i++) {
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aa[i][i]=sa[i];
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for (j=ija[i];j<=ija[i+1]-1;j++) aa[i][ija[j]]=sa[j];
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}
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printf("Original Matrix\n");
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for (i=1;i<=NP;i++) {
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for (j=1;j<=NP;j++) printf("%5.2f\t",a[i][j]);
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printf("\n");
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}
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printf("Reconstructed Matrix\n");
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for (i=1;i<=NP;i++) {
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for (j=1;j<=NP;j++) printf("%5.2f\t",aa[i][j]);
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printf("\n");
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}
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free_convert_matrix(a,1,NP,1,NP);
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free_matrix(aa,1,NP,1,NP);
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free_vector(sa,1,NMAX);
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free_lvector(ija,1,NMAX);
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return 0;
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}
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#undef NRANSI
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