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dlaset.f
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dlaset.f
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*>
\
brief
\
b
DLASET
initializes
the
off
-
diagonal
elements
and
the
diagonal
elements
of
a
matrix
to
given
values
.
*
*
===========
DOCUMENTATION
===========
*
*
Online
html
documentation
available
at
*
http
:
//
www
.
netlib
.
org
/
lapack
/
explore
-
html
/
*
*>
\
htmlonly
*>
Download
DLASET
+
dependencies
*>
<
a
href
=
"http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlaset.f"
>
*>
[
TGZ
]
</
a
>
*>
<
a
href
=
"http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlaset.f"
>
*>
[
ZIP
]
</
a
>
*>
<
a
href
=
"http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlaset.f"
>
*>
[
TXT
]
</
a
>
*>
\
endhtmlonly
*
*
Definition
:
*
===========
*
*
SUBROUTINE
DLASET
(
UPLO
,
M
,
N
,
ALPHA
,
BETA
,
A
,
LDA
)
*
*
..
Scalar
Arguments
..
*
CHARACTER
UPLO
*
INTEGER
LDA
,
M
,
N
*
DOUBLE PRECISION
ALPHA
,
BETA
*
..
*
..
Array
Arguments
..
*
DOUBLE PRECISION
A
(
LDA
,
*
)
*
..
*
*
*>
\
par
Purpose
:
*
=============
*>
*>
\
verbatim
*>
*>
DLASET
initializes
an
m
-
by
-
n
matrix
A
to
BETA
on
the
diagonal
and
*>
ALPHA
on
the
offdiagonals
.
*>
\
endverbatim
*
*
Arguments
:
*
==========
*
*>
\
param
[
in
]
UPLO
*>
\
verbatim
*>
UPLO
is
CHARACTER
*
1
*>
Specifies
the
part
of
the
matrix
A
to
be
set
.
*>
=
'U'
:
Upper
triangular
part
is
set
;
the
strictly
lower
*>
triangular
part
of
A
is
not
changed
.
*>
=
'L'
:
Lower
triangular
part
is
set
;
the
strictly
upper
*>
triangular
part
of
A
is
not
changed
.
*>
Otherwise
:
All
of
the
matrix
A
is
set
.
*>
\
endverbatim
*>
*>
\
param
[
in
]
M
*>
\
verbatim
*>
M
is
INTEGER
*>
The
number
of
rows
of
the
matrix
A
.
M
>=
0.
*>
\
endverbatim
*>
*>
\
param
[
in
]
N
*>
\
verbatim
*>
N
is
INTEGER
*>
The
number
of
columns
of
the
matrix
A
.
N
>=
0.
*>
\
endverbatim
*>
*>
\
param
[
in
]
ALPHA
*>
\
verbatim
*>
ALPHA
is
DOUBLE PRECISION
*>
The
constant
to
which
the
offdiagonal
elements
are
to
be
set
.
*>
\
endverbatim
*>
*>
\
param
[
in
]
BETA
*>
\
verbatim
*>
BETA
is
DOUBLE PRECISION
*>
The
constant
to
which
the
diagonal
elements
are
to
be
set
.
*>
\
endverbatim
*>
*>
\
param
[
in
,
out
]
A
*>
\
verbatim
*>
A
is
DOUBLE PRECISION
array
,
dimension
(
LDA
,
N
)
*>
On
exit
,
the
leading
m
-
by
-
n
submatrix
of
A
is
set
as
follows
:
*>
*>
if
UPLO
=
'U'
,
A
(
i
,
j
)
=
ALPHA
,
1
<=
i
<=
j
-
1
,
1
<=
j
<=
n
,
*>
if
UPLO
=
'L'
,
A
(
i
,
j
)
=
ALPHA
,
j
+
1
<=
i
<=
m
,
1
<=
j
<=
n
,
*>
otherwise
,
A
(
i
,
j
)
=
ALPHA
,
1
<=
i
<=
m
,
1
<=
j
<=
n
,
i
.ne.
j
,
*>
*>
and
,
for
all
UPLO
,
A
(
i
,
i
)
=
BETA
,
1
<=
i
<=
min
(
m
,
n
)
.
*>
\
endverbatim
*>
*>
\
param
[
in
]
LDA
*>
\
verbatim
*>
LDA
is
INTEGER
*>
The
leading
dimension
of
the
array
A
.
LDA
>=
max
(
1
,
M
)
.
*>
\
endverbatim
*
*
Authors
:
*
========
*
*>
\
author
Univ
.
of
Tennessee
*>
\
author
Univ
.
of
California
Berkeley
*>
\
author
Univ
.
of
Colorado
Denver
*>
\
author
NAG
Ltd
.
*
*>
\
date
September
2012
*
*>
\
ingroup
auxOTHERauxiliary
*
*
=====================================================================
SUBROUTINE
DLASET
(
UPLO
,
M
,
N
,
ALPHA
,
BETA
,
A
,
LDA
)
*
*
--
LAPACK
auxiliary
routine
(
version
3.4.2
)
--
*
--
LAPACK
is
a
software
package
provided
by
Univ
.
of
Tennessee
,
--
*
--
Univ
.
of
California
Berkeley
,
Univ
.
of
Colorado
Denver
and
NAG
Ltd
..
--
*
September
2012
*
*
..
Scalar
Arguments
..
CHARACTER
UPLO
INTEGER
LDA
,
M
,
N
DOUBLE PRECISION
ALPHA
,
BETA
*
..
*
..
Array
Arguments
..
DOUBLE PRECISION
A
(
LDA
,
*
)
*
..
*
*
=====================================================================
*
*
..
Local
Scalars
..
INTEGER
I
,
J
*
..
*
..
External
Functions
..
LOGICAL
LSAME
EXTERNAL
LSAME
*
..
*
..
Intrinsic
Functions
..
INTRINSIC
MIN
*
..
*
..
Executable
Statements
..
*
IF
(
LSAME
(
UPLO
,
'U'
)
)
THEN
*
*
Set
the
strictly
upper
triangular
or
trapezoidal
part
of
the
*
array
to
ALPHA
.
*
DO
20
J
=
2
,
N
DO
10
I
=
1
,
MIN
(
J
-
1
,
M
)
A
(
I
,
J
)
=
ALPHA
10
CONTINUE
20
CONTINUE
*
ELSE IF
(
LSAME
(
UPLO
,
'L'
)
)
THEN
*
*
Set
the
strictly
lower
triangular
or
trapezoidal
part
of
the
*
array
to
ALPHA
.
*
DO
40
J
=
1
,
MIN
(
M
,
N
)
DO
30
I
=
J
+
1
,
M
A
(
I
,
J
)
=
ALPHA
30
CONTINUE
40
CONTINUE
*
ELSE
*
*
Set
the
leading
m
-
by
-
n
submatrix
to
ALPHA
.
*
DO
60
J
=
1
,
N
DO
50
I
=
1
,
M
A
(
I
,
J
)
=
ALPHA
50
CONTINUE
60
CONTINUE
END IF
*
*
Set
the
first
min
(
M
,
N
)
diagonal
elements
to
BETA
.
*
DO
70
I
=
1
,
MIN
(
M
,
N
)
A
(
I
,
I
)
=
BETA
70
CONTINUE
*
RETURN
*
*
End
of
DLASET
*
END
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