Mercurial > hg > octave-lyh

annotate src/ov-null-mat.cc @ 8500:aaddb450b9aa

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[docs] can not => cannot
author Brian Gough <bjg@gnu.org>
date Tue, 13 Jan 2009 00:36:52 -0500
parents c777f3ce02d8
children 095ae5e0a831
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
1 /*
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
2
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
3 Copyright (C) 2008 Jaroslav Hajek
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
4
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
5 This file is part of Octave.
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
6
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
7 Octave is free software; you can redistribute it and/or modify it
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
8 under the terms of the GNU General Public License as published by the
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
9 Free Software Foundation; either version 3 of the License, or (at your
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
10 option) any later version.
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
11
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
12 Octave is distributed in the hope that it will be useful, but WITHOUT
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
15 for more details.
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
16
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
17 You should have received a copy of the GNU General Public License
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
18 along with Octave; see the file COPYING. If not, see
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
19 <http://www.gnu.org/licenses/>.
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
20
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
21 */
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
22
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
23 #ifdef HAVE_CONFIG_H
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
24 #include <config.h>
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
25 #endif
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
26
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
27 #include "ov-null-mat.h"
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
28 #include "ops.h"
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
29 #include "defun.h"
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
30
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
31 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_matrix, "null_matrix", "double");
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
32
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
33 const octave_value octave_null_matrix::instance (new octave_null_matrix ());
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
34
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
35 static octave_base_value *
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
36 default_null_matrix_numeric_conversion_function (const octave_base_value& a)
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
37 {
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
38 CAST_CONV_ARG (const octave_null_matrix&);
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
39
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
40 return a.empty_clone ();
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
41 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
42
8345
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
43 octave_base_value::type_conv_info
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
44 octave_null_matrix::numeric_conversion_function (void) const
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
45 {
8345
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
46 return octave_base_value::type_conv_info (default_null_matrix_numeric_conversion_function,
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
47 octave_matrix::static_type_id ());
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
48 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
49
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
50 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_str, "null_string", "char");
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
51
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
52 const octave_value octave_null_str::instance (new octave_null_str ());
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
53
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
54 static octave_base_value *
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
55 default_null_str_numeric_conversion_function (const octave_base_value& a)
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
56 {
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
57 CAST_CONV_ARG (const octave_null_str&);
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
58
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
59 return a.empty_clone ();
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
60 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
61
8345
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
62 octave_base_value::type_conv_info
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
63 octave_null_str::numeric_conversion_function (void) const
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
64 {
8345
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
65 return octave_base_value::type_conv_info (default_null_str_numeric_conversion_function,
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
66 octave_char_matrix_str::static_type_id ());
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
67 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
68
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
69 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_sq_str, "null_sq_string", "char");
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
70
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
71 const octave_value octave_null_sq_str::instance (new octave_null_sq_str ());
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
72
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
73 static octave_base_value *
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
74 default_null_sq_str_numeric_conversion_function (const octave_base_value& a)
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
75 {
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
76 CAST_CONV_ARG (const octave_null_sq_str&);
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
77
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
78 return a.empty_clone ();
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
79 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
80
8345
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
81 octave_base_value::type_conv_info
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
82 octave_null_sq_str::numeric_conversion_function (void) const
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
83 {
8345
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
84 return octave_base_value::type_conv_info (default_null_sq_str_numeric_conversion_function,
c777f3ce02d8 smarter conversion lookup
Jaroslav Hajek <highegg@gmail.com>
parents: 8150
diff changeset
85 octave_char_matrix_sq_str::static_type_id ());
8150
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
86 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
87
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
88 DEFUN (isnull, args, ,
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
89 "-*- texinfo -*-\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
90 @deftypefn {Built-in Function} {} isnull (@var{x})\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
91 Return 1 if @var{x} is a special null matrix, string or single quoted string.\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
92 Indexed assignment with such a value as right-hand side should delete array elements.\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
93 This function should be used when overloading indexed assignment for user-defined \n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
94 classes instead of @code{isempty}, to distinguish the cases:\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
95 @table @asis\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
96 @item @code{A(I) = []}\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
97 This should delete elements if @code{I} is nonempty.\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
98 @item @code{X = []; A(I) = X}\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
99 This should give an error if @code{I} is nonempty.\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
100 @end table\n\
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
101 @end deftypefn")
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
102 {
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
103 octave_value retval;
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
104
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
105 int nargin = args.length ();
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
106
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
107 if (nargin == 1 && args(0).is_defined ())
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
108 retval = args(0).is_null_value ();
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
109 else
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
110 print_usage ();
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
111
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
112 return retval;
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
113 }
283989f2da9b make null assignment matlab compatible
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
114