LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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lapacke_zheevx_work.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_zheevx_work (int matrix_order, char jobz, char range, char uplo, lapack_int n, lapack_complex_double *a, lapack_int lda, double vl, double vu, lapack_int il, lapack_int iu, double abstol, lapack_int *m, double *w, lapack_complex_double *z, lapack_int ldz, lapack_complex_double *work, lapack_int lwork, double *rwork, lapack_int *iwork, lapack_int *ifail)

Function/Subroutine Documentation

lapack_int LAPACKE_zheevx_work ( int  matrix_order,
char  jobz,
char  range,
char  uplo,
lapack_int  n,
lapack_complex_double a,
lapack_int  lda,
double  vl,
double  vu,
lapack_int  il,
lapack_int  iu,
double  abstol,
lapack_int m,
double *  w,
lapack_complex_double z,
lapack_int  ldz,
lapack_complex_double work,
lapack_int  lwork,
double *  rwork,
lapack_int iwork,
lapack_int ifail 
)

Definition at line 36 of file lapacke_zheevx_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_zheevx( &jobz, &range, &uplo, &n, a, &lda, &vl, &vu, &il, &iu,
&abstol, m, w, z, &ldz, work, &lwork, rwork, iwork,
ifail, &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 lda_t = MAX(1,n);
lapack_int ldz_t = MAX(1,n);
lapack_complex_double* a_t = NULL;
lapack_complex_double* z_t = NULL;
/* Check leading dimension(s) */
if( lda < n ) {
info = -7;
LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
return info;
}
if( ldz < ncols_z ) {
info = -16;
LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
return info;
}
/* Query optimal working array(s) size if requested */
if( lwork == -1 ) {
LAPACK_zheevx( &jobz, &range, &uplo, &n, a, &lda_t, &vl, &vu, &il,
&iu, &abstol, m, w, z, &ldz_t, work, &lwork, rwork,
iwork, ifail, &info );
return (info < 0) ? (info - 1) : info;
}
/* Allocate memory for temporary array(s) */
LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
if( a_t == NULL ) {
goto exit_level_0;
}
if( LAPACKE_lsame( jobz, 'v' ) ) {
ldz_t * MAX(1,ncols_z) );
if( z_t == NULL ) {
goto exit_level_1;
}
}
/* Transpose input matrices */
LAPACKE_zhe_trans( matrix_order, uplo, n, a, lda, a_t, lda_t );
/* Call LAPACK function and adjust info */
LAPACK_zheevx( &jobz, &range, &uplo, &n, a_t, &lda_t, &vl, &vu, &il,
&iu, &abstol, m, w, z_t, &ldz_t, work, &lwork, rwork,
iwork, ifail, &info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_zhe_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
if( LAPACKE_lsame( jobz, 'v' ) ) {
LAPACKE_zge_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_1:
LAPACKE_free( a_t );
exit_level_0:
LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
}
return info;
}

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