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
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