|
7
|
1 // f-lu.cc -*- C++ -*- |
|
1
|
2 /* |
|
|
3 |
|
453
|
4 Copyright (C) 1993, 1994 John W. Eaton |
|
1
|
5 |
|
|
6 This file is part of Octave. |
|
|
7 |
|
|
8 Octave is free software; you can redistribute it and/or modify it |
|
|
9 under the terms of the GNU General Public License as published by the |
|
|
10 Free Software Foundation; either version 2, or (at your option) any |
|
|
11 later version. |
|
|
12 |
|
|
13 Octave is distributed in the hope that it will be useful, but WITHOUT |
|
|
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
|
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
|
16 for more details. |
|
|
17 |
|
|
18 You should have received a copy of the GNU General Public License |
|
|
19 along with Octave; see the file COPYING. If not, write to the Free |
|
|
20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
|
|
21 |
|
|
22 */ |
|
|
23 |
|
240
|
24 #ifdef HAVE_CONFIG_H |
|
|
25 #include "config.h" |
|
1
|
26 #endif |
|
|
27 |
|
453
|
28 #include "dbleLU.h" |
|
|
29 #include "CmplxLU.h" |
|
1
|
30 |
|
|
31 #include "tree-const.h" |
|
|
32 #include "user-prefs.h" |
|
|
33 #include "gripes.h" |
|
7
|
34 #include "f-lu.h" |
|
1
|
35 |
|
|
36 #ifdef WITH_DLD |
|
|
37 tree_constant * |
|
162
|
38 builtin_lu_2 (const tree_constant *args, int nargin, int nargout) |
|
1
|
39 { |
|
|
40 return lu (args[1], nargout); |
|
|
41 } |
|
|
42 #endif |
|
|
43 |
|
|
44 tree_constant * |
|
162
|
45 lu (const tree_constant& a, int nargout) |
|
1
|
46 { |
|
|
47 tree_constant *retval = new tree_constant [4]; |
|
|
48 |
|
|
49 tree_constant tmp = a.make_numeric ();; |
|
|
50 |
|
|
51 if (tmp.rows () == 0 || tmp.columns () == 0) |
|
|
52 { |
|
|
53 int flag = user_pref.propagate_empty_matrices; |
|
|
54 if (flag != 0) |
|
|
55 { |
|
|
56 if (flag < 0) |
|
|
57 gripe_empty_arg ("lu", 0); |
|
|
58 Matrix m; |
|
|
59 retval = new tree_constant [4]; |
|
|
60 retval[0] = tree_constant (m); |
|
|
61 retval[1] = tree_constant (m); |
|
|
62 retval[2] = tree_constant (m); |
|
|
63 return retval; |
|
|
64 } |
|
|
65 else |
|
|
66 gripe_empty_arg ("lu", 1); |
|
|
67 } |
|
|
68 |
|
|
69 switch (tmp.const_type ()) |
|
|
70 { |
|
|
71 case tree_constant_rep::matrix_constant: |
|
|
72 { |
|
|
73 Matrix m = tmp.matrix_value (); |
|
|
74 if (m.rows () == m.columns ()) |
|
|
75 { |
|
|
76 LU fact (m); |
|
|
77 switch (nargout) |
|
|
78 { |
|
|
79 case 1: |
|
|
80 case 2: |
|
|
81 { |
|
|
82 Matrix P = fact.P (); |
|
|
83 Matrix L = P.transpose () * fact.L (); |
|
|
84 retval[0] = tree_constant (L); |
|
|
85 retval[1] = tree_constant (fact.U ()); |
|
|
86 } |
|
|
87 break; |
|
|
88 case 3: |
|
|
89 default: |
|
|
90 retval[0] = tree_constant (fact.L ()); |
|
|
91 retval[1] = tree_constant (fact.U ()); |
|
|
92 retval[2] = tree_constant (fact.P ()); |
|
|
93 break; |
|
|
94 } |
|
|
95 } |
|
|
96 else |
|
|
97 gripe_square_matrix_required ("lu"); |
|
|
98 } |
|
|
99 break; |
|
|
100 case tree_constant_rep::complex_matrix_constant: |
|
|
101 { |
|
|
102 ComplexMatrix m = tmp.complex_matrix_value (); |
|
|
103 if (m.rows () == m.columns ()) |
|
|
104 { |
|
|
105 ComplexLU fact (m); |
|
|
106 switch (nargout) |
|
|
107 { |
|
|
108 case 1: |
|
|
109 case 2: |
|
|
110 { |
|
|
111 ComplexMatrix P = fact.P (); |
|
|
112 ComplexMatrix L = P.transpose () * fact.L (); |
|
|
113 retval[0] = tree_constant (L); |
|
|
114 retval[1] = tree_constant (fact.U ()); |
|
|
115 } |
|
|
116 break; |
|
|
117 case 3: |
|
|
118 default: |
|
|
119 retval[0] = tree_constant (fact.L ()); |
|
|
120 retval[1] = tree_constant (fact.U ()); |
|
|
121 retval[2] = tree_constant (fact.P ()); |
|
|
122 break; |
|
|
123 } |
|
|
124 } |
|
|
125 else |
|
|
126 gripe_square_matrix_required ("lu"); |
|
|
127 } |
|
|
128 break; |
|
|
129 case tree_constant_rep::scalar_constant: |
|
|
130 { |
|
|
131 double d = tmp.double_value (); |
|
|
132 retval[0] = tree_constant (1.0); |
|
|
133 retval[1] = tree_constant (d); |
|
|
134 retval[2] = tree_constant (1.0); |
|
|
135 } |
|
|
136 break; |
|
|
137 case tree_constant_rep::complex_scalar_constant: |
|
|
138 { |
|
|
139 Complex c = tmp.complex_value (); |
|
|
140 retval[0] = tree_constant (1.0); |
|
|
141 retval[1] = tree_constant (c); |
|
|
142 retval[2] = tree_constant (1.0); |
|
|
143 } |
|
|
144 break; |
|
|
145 default: |
|
|
146 break; |
|
|
147 } |
|
|
148 return retval; |
|
|
149 } |
|
|
150 |
|
|
151 /* |
|
|
152 ;;; Local Variables: *** |
|
|
153 ;;; mode: C++ *** |
|
|
154 ;;; page-delimiter: "^/\\*" *** |
|
|
155 ;;; End: *** |
|
|
156 */ |
