# dlarscl2.f man page

dlarscl2.f —

## Synopsis

### Functions/Subroutines

subroutinedlarscl2(M, N, D, X, LDX)DLARSCL2performs reciprocal diagonal scaling on a vector.

## Function/Subroutine Documentation

### subroutine dlarscl2 (integerM, integerN, double precision, dimension( * )D, double precision, dimension( ldx, * )X, integerLDX)

**DLARSCL2** performs reciprocal diagonal scaling on a vector.

**Purpose:**

```
DLARSCL2 performs a reciprocal diagonal scaling on an vector:
x <-- inv(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 D and X. N >= 0.
```

*D*

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

*X*

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

*LDX*

```
LDX is INTEGER
The leading dimension of the vector X. LDX >= 0.
```

**Author:**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**

September 2012

Definition at line 91 of file dlarscl2.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

dlarscl2(3) is an alias of dlarscl2.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK