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Annotation of rpl/lapack/lapack/iladlc.f, revision 1.10

1.10    ! bertrand    1: *> \brief \b ILADLC
        !             2: *
        !             3: *  =========== DOCUMENTATION ===========
        !             4: *
        !             5: * Online html documentation available at 
        !             6: *            http://www.netlib.org/lapack/explore-html/ 
        !             7: *
        !             8: *> \htmlonly
        !             9: *> Download ILADLC + dependencies 
        !            10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/iladlc.f"> 
        !            11: *> [TGZ]</a> 
        !            12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/iladlc.f"> 
        !            13: *> [ZIP]</a> 
        !            14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/iladlc.f"> 
        !            15: *> [TXT]</a>
        !            16: *> \endhtmlonly 
        !            17: *
        !            18: *  Definition:
        !            19: *  ===========
        !            20: *
        !            21: *       INTEGER FUNCTION ILADLC( M, N, A, LDA )
        !            22: * 
        !            23: *       .. Scalar Arguments ..
        !            24: *       INTEGER            M, N, LDA
        !            25: *       ..
        !            26: *       .. Array Arguments ..
        !            27: *       DOUBLE PRECISION   A( LDA, * )
        !            28: *       ..
        !            29: *  
        !            30: *
        !            31: *> \par Purpose:
        !            32: *  =============
        !            33: *>
        !            34: *> \verbatim
        !            35: *>
        !            36: *> ILADLC scans A for its last non-zero column.
        !            37: *> \endverbatim
        !            38: *
        !            39: *  Arguments:
        !            40: *  ==========
        !            41: *
        !            42: *> \param[in] M
        !            43: *> \verbatim
        !            44: *>          M is INTEGER
        !            45: *>          The number of rows of the matrix A.
        !            46: *> \endverbatim
        !            47: *>
        !            48: *> \param[in] N
        !            49: *> \verbatim
        !            50: *>          N is INTEGER
        !            51: *>          The number of columns of the matrix A.
        !            52: *> \endverbatim
        !            53: *>
        !            54: *> \param[in] A
        !            55: *> \verbatim
        !            56: *>          A is DOUBLE PRECISION array, dimension (LDA,N)
        !            57: *>          The m by n matrix A.
        !            58: *> \endverbatim
        !            59: *>
        !            60: *> \param[in] LDA
        !            61: *> \verbatim
        !            62: *>          LDA is INTEGER
        !            63: *>          The leading dimension of the array A. LDA >= max(1,M).
        !            64: *> \endverbatim
        !            65: *
        !            66: *  Authors:
        !            67: *  ========
        !            68: *
        !            69: *> \author Univ. of Tennessee 
        !            70: *> \author Univ. of California Berkeley 
        !            71: *> \author Univ. of Colorado Denver 
        !            72: *> \author NAG Ltd. 
        !            73: *
        !            74: *> \date November 2011
1.1       bertrand   75: *
1.10    ! bertrand   76: *> \ingroup auxOTHERauxiliary
1.1       bertrand   77: *
1.10    ! bertrand   78: *  =====================================================================
        !            79:       INTEGER FUNCTION ILADLC( M, N, A, LDA )
1.1       bertrand   80: *
1.10    ! bertrand   81: *  -- LAPACK auxiliary routine (version 3.4.0) --
1.1       bertrand   82: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
                     83: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.10    ! bertrand   84: *     November 2011
1.1       bertrand   85: *
                     86: *     .. Scalar Arguments ..
                     87:       INTEGER            M, N, LDA
                     88: *     ..
                     89: *     .. Array Arguments ..
                     90:       DOUBLE PRECISION   A( LDA, * )
                     91: *     ..
                     92: *
                     93: *  =====================================================================
                     94: *
                     95: *     .. Parameters ..
                     96:       DOUBLE PRECISION ZERO
                     97:       PARAMETER ( ZERO = 0.0D+0 )
                     98: *     ..
                     99: *     .. Local Scalars ..
                    100:       INTEGER I
                    101: *     ..
                    102: *     .. Executable Statements ..
                    103: *
                    104: *     Quick test for the common case where one corner is non-zero.
                    105:       IF( N.EQ.0 ) THEN
                    106:          ILADLC = N
                    107:       ELSE IF( A(1, N).NE.ZERO .OR. A(M, N).NE.ZERO ) THEN
                    108:          ILADLC = N
                    109:       ELSE
                    110: *     Now scan each column from the end, returning with the first non-zero.
                    111:          DO ILADLC = N, 1, -1
                    112:             DO I = 1, M
                    113:                IF( A(I, ILADLC).NE.ZERO ) RETURN
                    114:             END DO
                    115:          END DO
                    116:       END IF
                    117:       RETURN
1.5       bertrand  118:       END