# claset.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
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claset.f

## SYNOPSIS

### Functions/Subroutines

subroutine claset (UPLO, M, N, ALPHA, BETA, A, LDA)
CLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

## Function/Subroutine Documentation

### subroutine claset (character UPLO, integer M, integer N, complex ALPHA, complex BETA, complex, dimension( lda, * ) A, integer LDA)

CLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

Purpose:

``` CLASET initializes a 2-D array A to BETA on the diagonal and
ALPHA on the offdiagonals.
```

Parameters:

UPLO

```          UPLO is CHARACTER*1
Specifies the part of the matrix A to be set.
= 'U':      Upper triangular part is set. The lower triangle
is unchanged.
= 'L':      Lower triangular part is set. The upper triangle
is unchanged.
Otherwise:  All of the matrix A is set.
```

M

```          M is INTEGER
On entry, M specifies the number of rows of A.
```

N

```          N is INTEGER
On entry, N specifies the number of columns of A.
```

ALPHA

```          ALPHA is COMPLEX
All the offdiagonal array elements are set to ALPHA.
```

BETA

```          BETA is COMPLEX
All the diagonal array elements are set to BETA.
```

A

```          A is COMPLEX array, dimension (LDA,N)
On entry, the m by n matrix A.
On exit, A(i,j) = ALPHA, 1 <= i <= m, 1 <= j <= n, i.ne.j;
A(i,i) = BETA , 1 <= i <= min(m,n)
```

LDA

```          LDA is INTEGER
The leading dimension of the array A.  LDA >= max(1,M).
```

Author:

Univ. of Tennessee

Univ. of California Berkeley