LAPACK  3.5.0
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lapacke_dstevr_work.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_dstevr_work (int matrix_order, char jobz, char range, lapack_int n, double *d, double *e, double vl, double vu, lapack_int il, lapack_int iu, double abstol, lapack_int *m, double *w, double *z, lapack_int ldz, lapack_int *isuppz, double *work, lapack_int lwork, lapack_int *iwork, lapack_int liwork)

Function/Subroutine Documentation

lapack_int LAPACKE_dstevr_work ( int  matrix_order,
char  jobz,
char  range,
lapack_int  n,
double *  d,
double *  e,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
double  abstol,
lapack_int m,
double *  w,
double *  z,
lapack_int  ldz,
lapack_int isuppz,
double *  work,
lapack_int  lwork,
lapack_int iwork,
lapack_int  liwork 
)

Definition at line 36 of file lapacke_dstevr_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_dstevr( &jobz, &range, &n, d, e, &vl, &vu, &il, &iu, &abstol, m,
w, z, &ldz, isuppz, work, &lwork, iwork, &liwork,
&info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int ncols_z = ( LAPACKE_lsame( range, 'a' ) ||
LAPACKE_lsame( range, 'v' ) ) ? n :
( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
lapack_int ldz_t = MAX(1,n);
double* z_t = NULL;
/* Check leading dimension(s) */
if( ldz < ncols_z ) {
info = -15;
LAPACKE_xerbla( "LAPACKE_dstevr_work", info );
return info;
}
/* Query optimal working array(s) size if requested */
if( liwork == -1 || lwork == -1 ) {
LAPACK_dstevr( &jobz, &range, &n, d, e, &vl, &vu, &il, &iu, &abstol,
m, w, z, &ldz_t, isuppz, work, &lwork, iwork,
&liwork, &info );
return (info < 0) ? (info - 1) : info;
}
/* Allocate memory for temporary array(s) */
if( LAPACKE_lsame( jobz, 'v' ) ) {
z_t = (double*)
LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,ncols_z) );
if( z_t == NULL ) {
goto exit_level_0;
}
}
/* Call LAPACK function and adjust info */
LAPACK_dstevr( &jobz, &range, &n, d, e, &vl, &vu, &il, &iu, &abstol, m,
w, z_t, &ldz_t, isuppz, work, &lwork, iwork, &liwork,
&info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
if( LAPACKE_lsame( jobz, 'v' ) ) {
LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
ldz );
}
/* Release memory and exit */
if( LAPACKE_lsame( jobz, 'v' ) ) {
LAPACKE_free( z_t );
}
exit_level_0:
LAPACKE_xerbla( "LAPACKE_dstevr_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_dstevr_work", info );
}
return info;
}

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