*> \brief \b ILAZLC
*
* =========== DOCUMENTATION ===========
*
* Online html documentation available at
*
http://www.netlib.org/lapack/explore-html/
*
*> \htmlonly
*> Download ILAZLC + dependencies
*> <a href=
"http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ilazlc.f">
*> [TGZ]</a>
*> <a href=
"http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ilazlc.f">
*> [ZIP]</a>
*> <a href=
"http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ilazlc.f">
*> [TXT]</a>
*> \endhtmlonly
*
* Definition:
* ===========
*
*
INTEGER FUNCTION ILAZLC( M, N, A, LDA )
*
* .. Scalar Arguments ..
*
INTEGER M, N, LDA
* ..
* .. Array Arguments ..
*
COMPLEX*16 A( LDA, * )
* ..
*
*
*> \par Purpose:
* =============
*>
*> \verbatim
*>
*> ILAZLC scans A for its last non-zero column.
*> \endverbatim
*
* Arguments:
* ==========
*
*> \param[
in] M
*> \verbatim
*> M is
INTEGER
*> The
number of rows of the matrix A.
*> \endverbatim
*>
*> \param[
in] N
*> \verbatim
*> N is
INTEGER
*> The
number of columns of the matrix A.
*> \endverbatim
*>
*> \param[
in] A
*> \verbatim
*> A is
COMPLEX*16 array,
dimension (LDA,N)
*> The m by n matrix A.
*> \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 November 2011
*
*> \ingroup complex16OTHERauxiliary
*
* =====================================================================
INTEGER FUNCTION ILAZLC( M, N, A, LDA )
*
* -- LAPACK auxiliary routine (version 3.4.0) --
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
* November 2011
*
* .. Scalar Arguments ..
INTEGER M, N, LDA
* ..
* .. Array Arguments ..
COMPLEX*16 A( LDA, * )
* ..
*
* =====================================================================
*
* .. Parameters ..
COMPLEX*16 ZERO
PARAMETER ( ZERO = (0.0D+0, 0.0D+0) )
* ..
* .. Local Scalars ..
INTEGER I
* ..
* .. Executable Statements ..
*
* Quick test for the
common case where one corner is non-zero.
IF( N.EQ.0 )
THEN
ILAZLC = N
ELSE IF( A(1, N).NE.ZERO .OR. A(M, N).NE.ZERO )
THEN
ILAZLC = N
ELSE
* Now scan each column from the
end, returning with the first non-zero.
DO ILAZLC = N, 1, -1
DO I = 1, M
IF( A(I, ILAZLC).NE.ZERO )
RETURN
END DO
END DO
END IF
RETURN
END
