---
name: "zlaset.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/zlaset.f"
---

# zlaset.f(3)

## NAME

SRC/zlaset.f

## SYNOPSIS

### Functions/Subroutines

subroutine **zlaset** (uplo, m, n, alpha, beta, a, lda)\
 **ZLASET** initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

## Function/Subroutine Documentation

### subroutine zlaset (character uplo, integer m, integer n, complex\*16 alpha, complex\*16 beta, complex\*16, dimension( lda, \* ) a, integer lda)

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

**Purpose:**

```
!>
!> ZLASET 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*16
!>          All the offdiagonal array elements are set to ALPHA.
!>
```

*BETA*

```
!>          BETA is COMPLEX*16
!>          All the diagonal array elements are set to BETA.
!>
```

*A*

```
!>          A is COMPLEX*16 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

Univ. of Colorado Denver

NAG Ltd.

Definition at line **105** of file **zlaset.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.