1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
SUBROUTINE UD01DD( M, N, NIN, A, LDA, INFO )
C
C SLICOT RELEASE 5.0.
C
C Copyright (c) 2002-2009 NICONET e.V.
C
C This program is free software: you can redistribute it and/or
C modify it under the terms of the GNU General Public License as
C published by the Free Software Foundation, either version 2 of
C the License, or (at your option) any later version.
C
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public License
C along with this program. If not, see
C <http://www.gnu.org/licenses/>.
C
C PURPOSE
C
C To read the elements of a sparse matrix.
C
C ARGUMENTS
C
C Input/Output Parameters
C
C M (input) INTEGER
C The number of rows of the matrix A. M >= 0.
C
C N (input) INTEGER
C The number of columns of the matrix A. N >= 0.
C
C NIN (input) INTEGER
C The input channel from which the elements of A are read.
C NIN >= 0.
C
C A (output) DOUBLE PRECISION array, dimension (LDA,N)
C The leading M-by-N part of this array contains the sparse
C matrix A. The not assigned elements are set to zero.
C
C LDA INTEGER
C The leading dimension of array A. LDA >= MAX(1,M).
C
C Error Indicator
C
C INFO INTEGER
C = 0: successful exit;
C < 0: if INFO = -i, the i-th argument had an illegal
C value;
C = 1 : if a row index i is read with i < 1 or i > M or
C a column index j is read with j < 1 or j > N.
C This is a warning.
C
C METHOD
C
C First, the elements A(i,j) with 1 <= i <= M and 1 <= j <= N are
C set to zero. Next the nonzero elements are read from the input
C file NIN. Each line of NIN must contain consecutively the values
C i, j, A(i,j). The routine terminates after the last line has been
C read.
C
C REFERENCES
C
C None.
C
C NUMERICAL ASPECTS
C
C None.
C
C CONTRIBUTOR
C
C Release 3.0: V. Sima, Katholieke Univ. Leuven, Belgium, June 1998.
C Based on routine RDSPAR by A.J. Geurts, Eindhoven University of
C Technology, Holland.
C
C REVISIONS
C
C -
C
C ******************************************************************
C
C .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D0 )
C .. Scalar Arguments ..
INTEGER INFO, LDA, M, N, NIN
C .. Array Arguments ..
DOUBLE PRECISION A(LDA,*)
C .. Local Scalars ..
INTEGER I, J
DOUBLE PRECISION AIJ
C .. External Subroutines ..
EXTERNAL DLASET, XERBLA
C .. Intrinsic Functions ..
INTRINSIC MAX
C
C .. Executable statements ..
C
INFO = 0
C
C Check the input scalar arguments.
C
IF( M.LT.0 ) THEN
INFO = -1
ELSE IF( N.LT.0 ) THEN
INFO = -2
ELSE IF( NIN.LT.0 ) THEN
INFO = -3
ELSE IF( LDA.LT.MAX( 1, M ) ) THEN
INFO = -5
END IF
C
IF ( INFO.NE.0 ) THEN
C
C Error return.
C
CALL XERBLA( 'UD01DD', -INFO )
RETURN
END IF
C
CALL DLASET( 'Full', M, N, ZERO, ZERO, A, LDA )
C
C Read (i, j, A(i,j)) of the nonzero elements one by one.
C
10 READ( NIN, FMT = *, END = 20 ) I, J, AIJ
IF ( I.LT.1 .OR. I.GT.M .OR. J.LT.1 .OR. J.GT.N ) THEN
INFO = 1
ELSE
A(I,J) = AIJ
END IF
GO TO 10
20 CONTINUE
C
RETURN
C *** Last line of UD01DD ***
END
|
