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From: George Pau <[EMAIL PROTECTED]>
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Organization: MIT
To: [EMAIL PROTECTED]
Subject: negative LDA in BLAS
Date: Tue, 30 Nov 2004 17:56:29 -0500
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Package: BLAS
Version: 1.1-9
When I use PETSC which uses BLAS, and while invoking KSPSolve, following error
may occur:
" ** On entry to DGEMV parameter number 6 had an illegal value"
According to the PETSC team, this is because some BLAS do not allow a negative
LDA (even though it should be legal). So, I suggest that this be corrected.
I am using Debian GNU/Linux 2.4.18, and libc-2.3.2.so.
Thanks,
George
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To: [EMAIL PROTECTED]
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Subject: Re: Bug#283731: negative LDA in BLAS
References: <[EMAIL PROTECTED]>
From: Camm Maguire <[EMAIL PROTECTED]>
Date: 22 Feb 2005 12:25:16 -0500
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Greetings! Negative LDA should trigger an error according to the blas
spec. For example, from the dgemv man page:
DGEMV(l) BLAS routine DGEMV(l)
NAME
DGEMV - perform one of the matrix-vector operations y :=3D
alpha*A*x + beta*y, or y :=3D alpha*A'*x + beta*y,
SYNOPSIS
SUBROUTINE DGEMV ( TRANS, M, N, ALPHA, A, LDA, X, INCX,
BETA, Y, INCY )
DOUBLE PRECISION ALPHA, BETA
INTEGER INCX, INCY, LDA, M, N
CHARACTER*1 TRANS
DOUBLE PRECISION A( LDA, * ), X( * ), Y( * )
PURPOSE
DGEMV performs one of the matrix-vector operations
where alpha and beta are scalars, x and y are vectors and
A is an m by n matrix.
PARAMETERS
TRANS - CHARACTER*1.
On entry, TRANS specifies the operation to be per=AD
formed as follows:
TRANS =3D 'N' or 'n' y :=3D alpha*A*x + beta*y.
TRANS =3D 'T' or 't' y :=3D alpha*A'*x + beta*y.
TRANS =3D 'C' or 'c' y :=3D alpha*A'*x + beta*y.
Unchanged on exit.
M - INTEGER.
On entry, M specifies the number of rows of the
matrix A. M must be at least zero. Unchanged on
exit.
N - INTEGER.
On entry, N specifies the number of columns of the
matrix A. N must be at least zero. Unchanged on
exit.
ALPHA - DOUBLE PRECISION.
On entry, ALPHA specifies the scalar alpha.
Unchanged on exit.
A - DOUBLE PRECISION array of DIMENSION ( LDA, n ).
Before entry, the leading m by n part of the array
A must contain the matrix of coefficients.
Unchanged on exit.
LDA - INTEGER.
On entry, LDA specifies the first dimension of A as
declared in the calling (sub) program. LDA must be
at least max( 1, m ). Unchanged on exit.
I beleive therefore that the package is correct as is. If you
disagree and have new information, please reopen this.
Take care,
George Pau <[EMAIL PROTECTED]> writes:
> Package: BLAS
> Version: 1.1-9
>=20
> When I use PETSC which uses BLAS, and while invoking KSPSolve, following =
error=20
> may occur:
>=20
> " ** On entry to DGEMV parameter number 6 had an illegal value"
>=20
> According to the PETSC team, this is because some BLAS do not allow a neg=
ative=20
> LDA (even though it should be legal). So, I suggest that this be correc=
ted.
>=20
> I am using Debian GNU/Linux 2.4.18, and libc-2.3.2.so.
>=20
> Thanks,
> George
>=20
>=20
>=20
>=20
>=20
--=20
Camm Maguire [EMAIL PROTECTED]
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
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