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

lapack_int LAPACKE_dsbtrd_work (int matrix_order, char vect, char uplo, lapack_int n, lapack_int kd, double *ab, lapack_int ldab, double *d, double *e, double *q, lapack_int ldq, double *work)

Function/Subroutine Documentation

lapack_int LAPACKE_dsbtrd_work ( int  matrix_order,
char  vect,
char  uplo,
lapack_int  n,
lapack_int  kd,
double *  ab,
lapack_int  ldab,
double *  d,
double *  e,
double *  q,
lapack_int  ldq,
double *  work 
)

Definition at line 36 of file lapacke_dsbtrd_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_dsbtrd( &vect, &uplo, &n, &kd, ab, &ldab, d, e, q, &ldq, work,
&info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int ldab_t = MAX(1,kd+1);
lapack_int ldq_t = MAX(1,n);
double* ab_t = NULL;
double* q_t = NULL;
/* Check leading dimension(s) */
if( ldab < n ) {
info = -7;
LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
return info;
}
if( ldq < n ) {
info = -11;
LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
return info;
}
/* Allocate memory for temporary array(s) */
ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
if( ab_t == NULL ) {
goto exit_level_0;
}
if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
if( q_t == NULL ) {
goto exit_level_1;
}
}
/* Transpose input matrices */
LAPACKE_dsb_trans( matrix_order, uplo, n, kd, ab, ldab, ab_t, ldab_t );
if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
LAPACKE_dge_trans( matrix_order, n, n, q, ldq, q_t, ldq_t );
}
/* Call LAPACK function and adjust info */
LAPACK_dsbtrd( &vect, &uplo, &n, &kd, ab_t, &ldab_t, d, e, q_t, &ldq_t,
work, &info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, kd, ab_t, ldab_t, ab,
ldab );
if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
}
/* Release memory and exit */
if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
LAPACKE_free( q_t );
}
exit_level_1:
LAPACKE_free( ab_t );
exit_level_0:
LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
}
return info;
}

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