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cs440-acg/ext/eigen/lapack/ilaclc.f

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+*> \brief \b ILACLC
+*
+*  =========== DOCUMENTATION ===========
+*
+* Online html documentation available at 
+*            http://www.netlib.org/lapack/explore-html/ 
+*
+*> \htmlonly
+*> Download ILACLC + dependencies 
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ilaclc.f"> 
+*> [TGZ]</a> 
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ilaclc.f"> 
+*> [ZIP]</a> 
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ilaclc.f"> 
+*> [TXT]</a>
+*> \endhtmlonly 
+*
+*  Definition:
+*  ===========
+*
+*       INTEGER FUNCTION ILACLC( M, N, A, LDA )
+* 
+*       .. Scalar Arguments ..
+*       INTEGER            M, N, LDA
+*       ..
+*       .. Array Arguments ..
+*       COMPLEX            A( LDA, * )
+*       ..
+*  
+*
+*> \par Purpose:
+*  =============
+*>
+*> \verbatim
+*>
+*> ILACLC 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 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 complexOTHERauxiliary
+*
+*  =====================================================================
+      INTEGER FUNCTION ILACLC( 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            A( LDA, * )
+*     ..
+*
+*  =====================================================================
+*
+*     .. Parameters ..
+      COMPLEX          ZERO
+      PARAMETER ( ZERO = (0.0E+0, 0.0E+0) )
+*     ..
+*     .. Local Scalars ..
+      INTEGER I
+*     ..
+*     .. Executable Statements ..
+*
+*     Quick test for the common case where one corner is non-zero.
+      IF( N.EQ.0 ) THEN
+         ILACLC = N
+      ELSE IF( A(1, N).NE.ZERO .OR. A(M, N).NE.ZERO ) THEN
+         ILACLC = N
+      ELSE
+*     Now scan each column from the end, returning with the first non-zero.
+         DO ILACLC = N, 1, -1
+            DO I = 1, M
+               IF( A(I, ILACLC).NE.ZERO ) RETURN
+            END DO
+         END DO
+      END IF
+      RETURN
+      END