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add numerical recipes library

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yenru0
2025-09-12 18:55:25 +09:00
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commit 2c75620ec9
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lib/nr/ansi/examples/xeigsrt.c Normal file
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/* Driver for routine eigsrt */
#include <stdio.h>
#define NRANSI
#include "nr.h"
#include "nrutil.h"
#define NP 10
int main(void)
{
int i,j,nrot;
static float c[NP][NP]=
{5.0,4.3,3.0,2.0,1.0,0.0,-1.0,-2.0,-3.0,-4.0,
4.3,5.1,4.0,3.0,2.0,1.0,0.0,-1.0,-2.0,-3.0,
3.0,4.0,5.0,4.0,3.0,2.0,1.0,0.0,-1.0,-2.0,
2.0,3.0,4.0,5.0,4.0,3.0,2.0,1.0,0.0,-1.0,
1.0,2.0,3.0,4.0,5.0,4.0,3.0,2.0,1.0,0.0,
0.0,1.0,2.0,3.0,4.0,5.0,4.0,3.0,2.0,1.0,
-1.0,0.0,1.0,2.0,3.0,4.0,5.0,4.0,3.0,2.0,
-2.0,-1.0,0.0,1.0,2.0,3.0,4.0,5.0,4.0,3.0,
-3.0,-2.0,-1.0,0.0,1.0,2.0,3.0,4.0,5.0,4.0,
-4.0,-3.0,-2.0,-1.0,0.0,1.0,2.0,3.0,4.0,5.0};
float *d,**v,**e;
d=vector(1,NP);
v=matrix(1,NP,1,NP);
e=convert_matrix(&c[0][0],1,NP,1,NP);
printf("****** Finding Eigenvectors ******\n");
jacobi(e,NP,d,v,&nrot);
printf("unsorted eigenvectors:\n");
for (i=1;i<=NP;i++) {
printf("eigenvalue %3d = %12.6f\n",i,d[i]);
printf("eigenvector:\n");
for (j=1;j<=NP;j++) {
printf("%12.6f",v[j][i]);
if ((j % 5) == 0) printf("\n");
}
printf("\n");
}
printf("\n****** Sorting Eigenvectors ******\n\n");
eigsrt(d,v,NP);
printf("sorted eigenvectors:\n");
for (i=1;i<=NP;i++) {
printf("eigenvalue %3d = %12.6f\n",i,d[i]);
printf("eigenvector:\n");
for (j=1;j<=NP;j++) {
printf("%12.6f",v[j][i]);
if ((j % 5) == 0) printf("\n");
}
printf("\n");
}
free_convert_matrix(e,1,NP,1,NP);
free_matrix(v,1,NP,1,NP);
free_vector(d,1,NP);
return 0;
}
#undef NRANSI