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

lapack_int LAPACKE_dlarfb (int matrix_order, char side, char trans, char direct, char storev, lapack_int m, lapack_int n, lapack_int k, const double *v, lapack_int ldv, const double *t, lapack_int ldt, double *c, lapack_int ldc)

Function/Subroutine Documentation

lapack_int LAPACKE_dlarfb ( int  matrix_order,
char  side,
char  trans,
char  direct,
char  storev,
lapack_int  m,
lapack_int  n,
lapack_int  k,
const double *  v,
lapack_int  ldv,
const double *  t,
lapack_int  ldt,
double *  c,
lapack_int  ldc 
)

Definition at line 36 of file lapacke_dlarfb.c.

{
lapack_int info = 0;
lapack_int ldwork = ( side=='l')?n:(( side=='r')?m:1);
double* work = NULL;
lapack_int ncols_v, nrows_v;
if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
LAPACKE_xerbla( "LAPACKE_dlarfb", -1 );
return -1;
}
#ifndef LAPACK_DISABLE_NAN_CHECK
/* Optionally check input matrices for NaNs */
ncols_v = LAPACKE_lsame( storev, 'c' ) ? k :
( ( LAPACKE_lsame( storev, 'r' ) &&
LAPACKE_lsame( side, 'l' ) ) ? m :
( ( LAPACKE_lsame( storev, 'r' ) &&
LAPACKE_lsame( side, 'r' ) ) ? n : 1) );
nrows_v = ( LAPACKE_lsame( storev, 'c' ) &&
LAPACKE_lsame( side, 'l' ) ) ? m :
( ( LAPACKE_lsame( storev, 'c' ) &&
LAPACKE_lsame( side, 'r' ) ) ? n :
( LAPACKE_lsame( storev, 'r' ) ? k : 1) );
if( LAPACKE_dge_nancheck( matrix_order, m, n, c, ldc ) ) {
return -13;
}
if( LAPACKE_dge_nancheck( matrix_order, k, k, t, ldt ) ) {
return -11;
}
if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'f' ) ) {
if( LAPACKE_dtr_nancheck( matrix_order, 'l', 'u', k, v, ldv ) )
return -9;
if( LAPACKE_dge_nancheck( matrix_order, nrows_v-k, ncols_v, &v[k*ldv],
ldv ) )
return -9;
} else if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'b' ) ) {
if( k > nrows_v ) {
LAPACKE_xerbla( "LAPACKE_dlarfb", -8 );
return -8;
}
if( LAPACKE_dtr_nancheck( matrix_order, 'u', 'u', k,
&v[(nrows_v-k)*ldv], ldv ) )
return -9;
if( LAPACKE_dge_nancheck( matrix_order, nrows_v-k, ncols_v, v, ldv ) )
return -9;
} else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
if( LAPACKE_dtr_nancheck( matrix_order, 'u', 'u', k, v, ldv ) )
return -9;
if( LAPACKE_dge_nancheck( matrix_order, nrows_v, ncols_v-k, &v[k],
ldv ) )
return -9;
} else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
if( k > ncols_v ) {
LAPACKE_xerbla( "LAPACKE_dlarfb", -8 );
return -8;
}
if( LAPACKE_dtr_nancheck( matrix_order, 'l', 'u', k, &v[ncols_v-k],
ldv ) )
return -9;
if( LAPACKE_dge_nancheck( matrix_order, nrows_v, ncols_v-k, v, ldv ) )
return -9;
}
#endif
/* Allocate memory for working array(s) */
work = (double*)LAPACKE_malloc( sizeof(double) * ldwork * MAX(1,k) );
if( work == NULL ) {
goto exit_level_0;
}
/* Call middle-level interface */
info = LAPACKE_dlarfb_work( matrix_order, side, trans, direct, storev, m, n,
k, v, ldv, t, ldt, c, ldc, work, ldwork );
/* Release memory and exit */
LAPACKE_free( work );
exit_level_0:
if( info == LAPACK_WORK_MEMORY_ERROR ) {
LAPACKE_xerbla( "LAPACKE_dlarfb", info );
}
return info;
}

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