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/**********************************************************************
lapack_dstedc1.c:
lapack_dstedc1.c is a subroutine to find eigenvalues and eigenvectors
of tridiagonlized real matrix using lapack's routines dstedc.
Log of lapack_dstedc1.c:
Dec/24/2004 Released by T.Ozaki
***********************************************************************/
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include "openmx_common.h"
#include "lapack_prototypes.h"
#ifdef nompi
#include "mimic_mpi.h"
#else
#include "mpi.h"
#endif
void lapack_dstedc1(INTEGER N, double *D, double *E, double *W, double **ev)
{
int i,j;
char *COMPZ="I";
INTEGER IL,IU;
double ABSTOL_GR=1.0e-14;
double *Z;
INTEGER LDZ;
INTEGER LWORK;
double *WORK;
INTEGER *IWORK;
INTEGER LIWORK;
INTEGER INFO;
LDZ = N;
Z = (double*)malloc(sizeof(double)*LDZ*N);
LWORK = 1 + 4*N + N*N;
LIWORK = 3 + 5*N;
WORK = (double*)malloc(sizeof(double)*LWORK);
IWORK = (INTEGER*)malloc(sizeof(INTEGER)*LIWORK);
F77_NAME(dstedc,DSTEDC)( COMPZ, &N, D, E, Z, &LDZ, WORK, &LWORK, IWORK, &LIWORK, &INFO );
/* store eigenvectors */
for (i=0; i<N; i++) {
for (j=0; j<N; j++) {
ev[i+1][j+1]= Z[i*N+j];
}
}
/* shift ko by 1 */
for (i=N; i>=1; i--){
W[i]= D[i-1];
}
if (INFO>0) {
/*
printf("\n error in dstedc_, info=%d\n\n",INFO);
*/
}
if (INFO<0) {
printf("info=%d in dstedc_\n",INFO);
MPI_Finalize();
exit(0);
}
free(Z);
free(WORK);
free(IWORK);
}
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