source: pacpussensors/trunk/Vislab/lib3dv-1.2.0/lib3dv/eigen/lapack/ilaslc.f@ 141

Last change on this file since 141 was 136, checked in by ldecherf, 8 years ago

Doc
File size: 2.9 KB
Line 
1*> \brief \b ILASLC
2*
3* =========== DOCUMENTATION ===========
4*
5* Online html documentation available at
6* http://www.netlib.org/lapack/explore-html/
7*
8*> \htmlonly
9*> Download ILASLC + dependencies
10*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ilaslc.f">
11*> [TGZ]</a>
12*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ilaslc.f">
13*> [ZIP]</a>
14*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ilaslc.f">
15*> [TXT]</a>
16*> \endhtmlonly
17*
18* Definition:
19* ===========
20*
21* INTEGER FUNCTION ILASLC( M, N, A, LDA )
22*
23* .. Scalar Arguments ..
24* INTEGER M, N, LDA
25* ..
26* .. Array Arguments ..
27* REAL A( LDA, * )
28* ..
29*
30*
31*> \par Purpose:
32* =============
33*>
34*> \verbatim
35*>
36*> ILASLC 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 REAL 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 realOTHERauxiliary
77*
78* =====================================================================
79 INTEGER FUNCTION ILASLC( M, N, A, LDA )
80*
81* -- LAPACK auxiliary routine (version 3.4.0) --
82* -- LAPACK is a software package provided by Univ. of Tennessee, --
83* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
84* November 2011
85*
86* .. Scalar Arguments ..
87 INTEGER M, N, LDA
88* ..
89* .. Array Arguments ..
90 REAL A( LDA, * )
91* ..
92*
93* =====================================================================
94*
95* .. Parameters ..
96 REAL 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 ILASLC = N
107 ELSE IF( A(1, N).NE.ZERO .OR. A(M, N).NE.ZERO ) THEN
108 ILASLC = N
109 ELSE
110* Now scan each column from the end, returning with the first non-zero.
111 DO ILASLC = N, 1, -1
112 DO I = 1, M
113 IF( A(I, ILASLC).NE.ZERO ) RETURN
114 END DO
115 END DO
116 END IF
117 RETURN
118 END
Note: See TracBrowser for help on using the repository browser.