Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

?heswapr

Applies an elementary permutation on the rows and columns of a Hermitian matrix.

Syntax

call cheswapr
(
uplo
,
n
,
a
,
lda
,
i1
,
i2
)
call zheswapr
(
uplo
,
n
,
a
,
lda
,
i1
,
i2
)
call heswapr
(
a
,
i1
,
i2
[
,
uplo
]
)
Include Files
  • mkl.fi
    ,
    lapack.f90
Description
The routine applies an elementary permutation on the rows and columns of a Hermitian matrix.
Input Parameters
The data types are given for the Fortran interface.
uplo
CHARACTER*1
.
Must be
'U'
or
'L'
.
Indicates how the input matrix
A
has been factored:
If
uplo
=
'U'
, the array
a
stores the upper triangular factor
U
of the factorization
A
=
U*D*U
H
.
If
uplo
=
'L'
, the array
a
stores the lower triangular factor
L
of the factorization
A
=
L*D*L
H
.
n
INTEGER
.
The order of matrix
A
;
n
0.
nrhs
INTEGER
.
The number of right-hand sides;
nrhs
0.
a
COMPLEX
for
cheswapr
DOUBLE COMPLEX
for
zheswapr
Array of size
(
lda
,
n
)
.
The array
a
contains the block diagonal matrix
D
and the multipliers used to obtain the factor
U
or
L
as computed by
?hetrf
.
lda
INTEGER
. The leading dimension of the array
a
.
lda
max
(1,
n
).
i1
INTEGER
.
Index of the first row to swap.
i2
INTEGER
.
Index of the second row to swap.
Output Parameters
a
If
info
= 0
, the inverse of the original matrix.
If
info
=
'U'
, the upper triangular part of the inverse is formed and the part of
A
below the diagonal is not referenced.
If
info
=
'L'
, the lower triangular part of the inverse is formed and the part of
A
above the diagonal is not referenced.
LAPACK 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see LAPACK 95 Interface Conventions.
Specific details for the routine
heswapr
interface are as follows:
a
Holds the matrix
A
of size (
n
,
n
).
i1
Holds the index for swap.
i2
Holds the index for swap.
uplo
Must be
'U'
or
'L'
.