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

lapack_int LAPACKE_dstevr (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)

Function/Subroutine Documentation

lapack_int LAPACKE_dstevr ( 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 
)

Definition at line 36 of file lapacke_dstevr.c.

{
lapack_int info = 0;
lapack_int liwork = -1;
lapack_int lwork = -1;
lapack_int* iwork = NULL;
double* work = NULL;
lapack_int iwork_query;
double work_query;
if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
LAPACKE_xerbla( "LAPACKE_dstevr", -1 );
return -1;
}
#ifndef LAPACK_DISABLE_NAN_CHECK
/* Optionally check input matrices for NaNs */
if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
return -11;
}
if( LAPACKE_d_nancheck( n, d, 1 ) ) {
return -5;
}
if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
return -6;
}
if( LAPACKE_lsame( range, 'v' ) ) {
if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
return -7;
}
}
if( LAPACKE_lsame( range, 'v' ) ) {
if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
return -8;
}
}
#endif
/* Query optimal working array(s) size */
info = LAPACKE_dstevr_work( matrix_order, jobz, range, n, d, e, vl, vu, il,
iu, abstol, m, w, z, ldz, isuppz, &work_query,
lwork, &iwork_query, liwork );
if( info != 0 ) {
goto exit_level_0;
}
liwork = (lapack_int)iwork_query;
lwork = (lapack_int)work_query;
/* Allocate memory for work arrays */
iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
if( iwork == NULL ) {
goto exit_level_0;
}
work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
if( work == NULL ) {
goto exit_level_1;
}
/* Call middle-level interface */
info = LAPACKE_dstevr_work( matrix_order, jobz, range, n, d, e, vl, vu, il,
iu, abstol, m, w, z, ldz, isuppz, work, lwork,
iwork, liwork );
/* Release memory and exit */
LAPACKE_free( work );
exit_level_1:
LAPACKE_free( iwork );
exit_level_0:
if( info == LAPACK_WORK_MEMORY_ERROR ) {
LAPACKE_xerbla( "LAPACKE_dstevr", info );
}
return info;
}

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