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laset(3) LAPACK laset(3)

NAME

laset - laset: set matrix

SYNOPSIS

Functions


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. subroutine dlaset (uplo, m, n, alpha, beta, a, lda)
DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values. subroutine slaset (uplo, m, n, alpha, beta, a, lda)
SLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values. 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.

Detailed Description

Function 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

Univ. of Colorado Denver

NAG Ltd.

subroutine dlaset (character uplo, integer m, integer n, double precision alpha, double precision beta, double precision, dimension( lda, * ) a, integer lda)

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

Purpose:

!>
!> DLASET initializes an m-by-n matrix 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 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.
!>

M

!>          M is INTEGER
!>          The number of rows of the matrix A.  M >= 0.
!>

N

!>          N is INTEGER
!>          The number of columns of the matrix A.  N >= 0.
!>

ALPHA

!>          ALPHA is DOUBLE PRECISION
!>          The constant to which the offdiagonal elements are to be set.
!>

BETA

!>          BETA is DOUBLE PRECISION
!>          The constant to which the diagonal elements are to be set.
!>

A

!>          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).
!>

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.

subroutine slaset (character uplo, integer m, integer n, real alpha, real beta, real, dimension( lda, * ) a, integer lda)

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

Purpose:

!>
!> SLASET initializes an m-by-n matrix 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 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.
!>

M

!>          M is INTEGER
!>          The number of rows of the matrix A.  M >= 0.
!>

N

!>          N is INTEGER
!>          The number of columns of the matrix A.  N >= 0.
!>

ALPHA

!>          ALPHA is REAL
!>          The constant to which the offdiagonal elements are to be set.
!>

BETA

!>          BETA is REAL
!>          The constant to which the diagonal elements are to be set.
!>

A

!>          A is REAL 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).
!>

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.

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.

Author

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