Annotation of rpl/lapack/lapack/iladlr.f, revision 1.10
1.10 ! bertrand 1: *> \brief \b ILADLR
! 2: *
! 3: * =========== DOCUMENTATION ===========
! 4: *
! 5: * Online html documentation available at
! 6: * http://www.netlib.org/lapack/explore-html/
! 7: *
! 8: *> \htmlonly
! 9: *> Download ILADLR + dependencies
! 10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/iladlr.f">
! 11: *> [TGZ]</a>
! 12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/iladlr.f">
! 13: *> [ZIP]</a>
! 14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/iladlr.f">
! 15: *> [TXT]</a>
! 16: *> \endhtmlonly
! 17: *
! 18: * Definition:
! 19: * ===========
! 20: *
! 21: * INTEGER FUNCTION ILADLR( 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: *> ILADLR scans A for its last non-zero row.
! 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
! 75: *
! 76: *> \ingroup auxOTHERauxiliary
! 77: *
! 78: * =====================================================================
1.5 bertrand 79: INTEGER FUNCTION ILADLR( 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, J
101: * ..
102: * .. Executable Statements ..
103: *
104: * Quick test for the common case where one corner is non-zero.
105: IF( M.EQ.0 ) THEN
106: ILADLR = M
107: ELSE IF( A(M, 1).NE.ZERO .OR. A(M, N).NE.ZERO ) THEN
108: ILADLR = M
109: ELSE
110: * Scan up each column tracking the last zero row seen.
111: ILADLR = 0
112: DO J = 1, N
1.9 bertrand 113: I=M
114: DO WHILE ((A(I,J).NE.ZERO).AND.(I.GE.1))
115: I=I-1
1.10 ! bertrand 116: IF (I.EQ.0) THEN
! 117: EXIT
! 118: END IF
1.9 bertrand 119: ENDDO
1.1 bertrand 120: ILADLR = MAX( ILADLR, I )
121: END DO
122: END IF
123: RETURN
1.5 bertrand 124: END
CVSweb interface <joel.bertrand@systella.fr>