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/**********************************************************************
lapack_dstegr2.c:
lapack_dstegr2.c is a subroutine to find eigenvalues and eigenvectors
of tridiagonlized real matrix using lapack's routines dstegr.
Log of lapack_dstegr2.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_dstegr2(INTEGER N, INTEGER EVmax, double *D, double *E, double *W, dcomplex **ev)
{
int i,j;
char *JOBZ="V";
char *RANGE="A";
double VL,VU; /* dummy */
INTEGER IL,IU;
double ABSTOL_GR=1.0e-13;
INTEGER M;
double *Z;
INTEGER LDZ;
INTEGER *ISUPPZ;
INTEGER LWORK;
double *WORK;
INTEGER *IWORK;
INTEGER LIWORK;
INTEGER INFO;
IL = 1;
IU = N;
M = IU - IL + 1;
LDZ = N;
Z = (double*)malloc(sizeof(double)*LDZ*N);
ISUPPZ = (INTEGER*)malloc(sizeof(INTEGER)*2*M);
LWORK = 18*N;
LIWORK = 10*N;
WORK = (double*)malloc(sizeof(double)*LWORK);
IWORK = (INTEGER*)malloc(sizeof(INTEGER)*LIWORK);
F77_NAME(dstegr,DSTEGR)( JOBZ, RANGE, &N, D, E, &VL, &VU, &IL, &IU, &ABSTOL_GR,
&M, W, Z, &LDZ, ISUPPZ, WORK, &LWORK, IWORK, &LIWORK, &INFO );
/* store eigenvectors */
for (i=0; i<N; i++) {
for (j=0; j<N; j++) {
ev[i+1][j+1].r = Z[i*N+j];
ev[i+1][j+1].i = 0.0;
}
}
/* shift ko by 1 */
for (i=N; i>=1; i--){
W[i]= W[i-1];
}
if (INFO>0) {
/*
printf("\n error in dstegr_, info=%d\n\n",INFO);
*/
}
if (INFO<0) {
printf("info=%d in dstegr_\n",INFO);
MPI_Finalize();
exit(0);
}
free(Z);
free(ISUPPZ);
free(WORK);
free(IWORK);
}
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