# lascl2 - Man Page

lascl2: diagonal scale matrix, A = D A

## Synopsis

### Functions

subroutine clascl2 (m, n, d, x, ldx)
CLASCL2 performs diagonal scaling on a matrix.
subroutine dlascl2 (m, n, d, x, ldx)
DLASCL2 performs diagonal scaling on a matrix.
subroutine slascl2 (m, n, d, x, ldx)
SLASCL2 performs diagonal scaling on a matrix.
subroutine zlascl2 (m, n, d, x, ldx)
ZLASCL2 performs diagonal scaling on a matrix.

## Function Documentation

### subroutine clascl2 (integer m, integer n, real, dimension( * ) d, complex, dimension( ldx, * ) x, integer ldx)

CLASCL2 performs diagonal scaling on a matrix.

Purpose:

``` CLASCL2 performs a diagonal scaling on a matrix:
x <-- D * x
where the diagonal REAL matrix D is stored as a matrix.

Eventually to be replaced by BLAS_cge_diag_scale in the new BLAS
standard.```
Parameters

M

```          M is INTEGER
The number of rows of D and X. M >= 0.```

N

```          N is INTEGER
The number of columns of X. N >= 0.```

D

```          D is REAL array, length M
Diagonal matrix D, stored as a vector of length M.```

X

```          X is COMPLEX array, dimension (LDX,N)
On entry, the matrix X to be scaled by D.
On exit, the scaled matrix.```

LDX

```          LDX is INTEGER
The leading dimension of the matrix X. LDX >= M.```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 90 of file clascl2.f.

### subroutine dlascl2 (integer m, integer n, double precision, dimension( * ) d, double precision, dimension( ldx, * ) x, integer ldx)

DLASCL2 performs diagonal scaling on a matrix.

Purpose:

``` DLASCL2 performs a diagonal scaling on a matrix:
x <-- D * x
where the diagonal matrix D is stored as a vector.

Eventually to be replaced by BLAS_dge_diag_scale in the new BLAS
standard.```
Parameters

M

```          M is INTEGER
The number of rows of D and X. M >= 0.```

N

```          N is INTEGER
The number of columns of X. N >= 0.```

D

```          D is DOUBLE PRECISION array, length M
Diagonal matrix D, stored as a vector of length M.```

X

```          X is DOUBLE PRECISION array, dimension (LDX,N)
On entry, the matrix X to be scaled by D.
On exit, the scaled matrix.```

LDX

```          LDX is INTEGER
The leading dimension of the matrix X. LDX >= M.```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 89 of file dlascl2.f.

### subroutine slascl2 (integer m, integer n, real, dimension( * ) d, real, dimension( ldx, * ) x, integer ldx)

SLASCL2 performs diagonal scaling on a matrix.

Purpose:

``` SLASCL2 performs a diagonal scaling on a matrix:
x <-- D * x
where the diagonal matrix D is stored as a vector.

Eventually to be replaced by BLAS_sge_diag_scale in the new BLAS
standard.```
Parameters

M

```          M is INTEGER
The number of rows of D and X. M >= 0.```

N

```          N is INTEGER
The number of columns of X. N >= 0.```

D

```          D is REAL array, length M
Diagonal matrix D, stored as a vector of length M.```

X

```          X is REAL array, dimension (LDX,N)
On entry, the matrix X to be scaled by D.
On exit, the scaled matrix.```

LDX

```          LDX is INTEGER
The leading dimension of the matrix X. LDX >= M.```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 89 of file slascl2.f.

### subroutine zlascl2 (integer m, integer n, double precision, dimension( * ) d, complex*16, dimension( ldx, * ) x, integer ldx)

ZLASCL2 performs diagonal scaling on a matrix.

Purpose:

``` ZLASCL2 performs a diagonal scaling on a matrix:
x <-- D * x
where the DOUBLE PRECISION diagonal matrix D is stored as a vector.

Eventually to be replaced by BLAS_zge_diag_scale in the new BLAS
standard.```
Parameters

M

```          M is INTEGER
The number of rows of D and X. M >= 0.```

N

```          N is INTEGER
The number of columns of X. N >= 0.```

D

```          D is DOUBLE PRECISION array, length M
Diagonal matrix D, stored as a vector of length M.```

X

```          X is COMPLEX*16 array, dimension (LDX,N)
On entry, the matrix X to be scaled by D.
On exit, the scaled matrix.```

LDX

```          LDX is INTEGER
The leading dimension of the matrix X. LDX >= M.```
Author

Univ. of Tennessee

Univ. of California Berkeley