SRC/dlaset.f(3)

💅 NAME

SRC/dlaset.f — bestie, that’s literally the whole name. Welcome to the SRC/dlaset.f(3) page from the Library Functions Manual ✨

✨ SYNOPSIS

   Functions/Subroutines
       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.

The main character here is dlaset: it initializes the off-diagonal elements and the diagonal elements of a matrix to given values. Iconic behavior, no cap 💅

🫶 Function/Subroutine Documentation

🌟 subroutine dlaset

   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. Periodt 💖

🎀 Purpose

!>
!> DLASET initializes an m-by-n matrix A to BETA on the diagonal and
!> ALPHA on the offdiagonals.
!>

So: diagonal gets BETA, off-diagonals get ALPHA. That’s the vibe 🦋

💖 Parameters

• UPLO — UPLO is CHARACTER*1. It specifies the part of the matrix A to be set. The tea is:
  • = '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.

Definition at line 109 of file dlaset.f.

🌈 Author

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