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references/igraph-1.0.1/vendor/lapack/dlaset.c
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/* -- translated by f2c (version 20240504).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#include "f2c.h"
/* > \brief \b DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given val
ues.
=========== DOCUMENTATION ===========
Online html documentation available at
http://www.netlib.org/lapack/explore-html/
> \htmlonly
> Download DLASET + dependencies
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlaset.
f">
> [TGZ]</a>
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlaset.
f">
> [ZIP]</a>
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlaset.
f">
> [TXT]</a>
> \endhtmlonly
Definition:
===========
SUBROUTINE DLASET( UPLO, M, N, ALPHA, BETA, A, LDA )
CHARACTER UPLO
INTEGER LDA, M, N
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION A( LDA, * )
> \par Purpose:
=============
>
> \verbatim
>
> DLASET initializes an m-by-n matrix A to BETA on the diagonal and
> ALPHA on the offdiagonals.
> \endverbatim
Arguments:
==========
> \param[in] UPLO
> \verbatim
> 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.
> \endverbatim
>
> \param[in] M
> \verbatim
> M is INTEGER
> The number of rows of the matrix A. M >= 0.
> \endverbatim
>
> \param[in] N
> \verbatim
> N is INTEGER
> The number of columns of the matrix A. N >= 0.
> \endverbatim
>
> \param[in] ALPHA
> \verbatim
> ALPHA is DOUBLE PRECISION
> The constant to which the offdiagonal elements are to be set.
> \endverbatim
>
> \param[in] BETA
> \verbatim
> BETA is DOUBLE PRECISION
> The constant to which the diagonal elements are to be set.
> \endverbatim
>
> \param[in,out] A
> \verbatim
> 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).
> \endverbatim
>
> \param[in] LDA
> \verbatim
> LDA is INTEGER
> The leading dimension of the array A. LDA >= max(1,M).
> \endverbatim
Authors:
========
> \author Univ. of Tennessee
> \author Univ. of California Berkeley
> \author Univ. of Colorado Denver
> \author NAG Ltd.
> \date September 2012
> \ingroup auxOTHERauxiliary
=====================================================================
Subroutine */ int igraphdlaset_(char *uplo, integer *m, integer *n, doublereal *
alpha, doublereal *beta, doublereal *a, integer *lda)
{
/* System generated locals */
integer a_dim1, a_offset, i__1, i__2, i__3;
/* Local variables */
integer i__, j;
extern logical igraphlsame_(char *, char *);
/* -- LAPACK auxiliary routine (version 3.4.2) --
-- LAPACK is a software package provided by Univ. of Tennessee, --
-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
September 2012
=====================================================================
Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
/* Function Body */
if (igraphlsame_(uplo, "U")) {
/* Set the strictly upper triangular or trapezoidal part of the
array to ALPHA. */
i__1 = *n;
for (j = 2; j <= i__1; ++j) {
/* Computing MIN */
i__3 = j - 1;
i__2 = min(i__3,*m);
for (i__ = 1; i__ <= i__2; ++i__) {
a[i__ + j * a_dim1] = *alpha;
/* L10: */
}
/* L20: */
}
} else if (igraphlsame_(uplo, "L")) {
/* Set the strictly lower triangular or trapezoidal part of the
array to ALPHA. */
i__1 = min(*m,*n);
for (j = 1; j <= i__1; ++j) {
i__2 = *m;
for (i__ = j + 1; i__ <= i__2; ++i__) {
a[i__ + j * a_dim1] = *alpha;
/* L30: */
}
/* L40: */
}
} else {
/* Set the leading m-by-n submatrix to ALPHA. */
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
a[i__ + j * a_dim1] = *alpha;
/* L50: */
}
/* L60: */
}
}
/* Set the first min(M,N) diagonal elements to BETA. */
i__1 = min(*m,*n);
for (i__ = 1; i__ <= i__1; ++i__) {
a[i__ + i__ * a_dim1] = *beta;
/* L70: */
}
return 0;
/* End of DLASET */
} /* igraphdlaset_ */