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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
########################################################################
##
## Copyright (C) 1994-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{str} =} strcat (@var{s1}, @var{s2}, @dots{})
## Return a string containing all the arguments concatenated horizontally.
##
## If the arguments are cell strings, @code{strcat} returns a cell string
## with the individual cells concatenated. For numerical input, each element
## is converted to the corresponding ASCII character. Trailing white space
## for any character string input is eliminated before the strings are
## concatenated. Note that cell string values do @strong{not} have
## whitespace trimmed.
##
## For example:
##
## @example
## @group
## strcat ("|", " leading space is preserved", "|")
## @result{} | leading space is preserved|
## @end group
## @end example
##
## @example
## @group
## strcat ("|", "trailing space is eliminated ", "|")
## @result{} |trailing space is eliminated|
## @end group
## @end example
##
## @example
## @group
## strcat ("homogeneous space |", " ", "| is also eliminated")
## @result{} homogeneous space || is also eliminated
## @end group
## @end example
##
## @example
## @group
## s = [ "ab"; "cde" ];
## strcat (s, s, s)
## @result{}
## "ababab "
## "cdecdecde"
## @end group
## @end example
##
## @example
## @group
## s = @{ "ab"; "cd " @};
## strcat (s, s, s)
## @result{}
## @{
## [1,1] = ababab
## [2,1] = cd cd cd
## @}
## @end group
## @end example
##
## @seealso{cstrcat, char, strvcat}
## @end deftypefn
function str = strcat (varargin)
if (nargin == 0)
str = "";
elseif (nargin == 1)
if (iscellstr (varargin{1}))
str = varargin{1};
elseif (isreal (varargin{1}) || ischar (varargin{1}))
str = char (cellstr (varargin{1}));
else
error ("strcat: inputs must be strings or cells of strings");
endif
else
## Convert to cells of strings
uo = "uniformoutput";
reals = cellfun ("isreal", varargin);
if (any (reals))
varargin(reals) = cellfun ("char", varargin(reals), uo, false);
endif
chars = cellfun ("isclass", varargin, "char");
allchar = all (chars);
varargin(chars) = cellfun ("cellstr", varargin(chars), uo, false);
if (! all (cellfun ("isclass", varargin, "cell")))
error ("strcat: inputs must be strings or cells of strings");
endif
## We don't actually need to bring all cells to common size, because
## cellfun can now expand scalar cells.
err = common_size (varargin{:});
if (err)
error ("strcat: arguments must be the same size, or be scalars");
endif
## Cellfun handles everything for us.
str = cellfun ("horzcat", varargin{:}, uo, false);
if (allchar)
## If all inputs were strings, return strings.
str = char (str);
endif
endif
endfunction
## test the dimensionality
## 1d
%!assert (strcat ("ab ", "ab "), "abab")
%!assert (strcat ({"ab "}, "ab "), {"ab ab"})
%!assert (strcat ("ab ", {"ab "}), {"abab "})
%!assert (strcat ({"ab "}, {"ab "}), {"ab ab "})
%!assert (strcat ("", "ab"), "ab")
%!assert (strcat ("", {"ab"}, {""}), {"ab"})
## 2d
%!assert (strcat (["ab ";"cde"], ["ab ";"cde"]), ["abab ";"cdecde"])
## test for deblanking implied trailing spaces of character input
%!assert (strcat ("foo", "bar"), "foobar")
%!assert (strcat (["a "; "bb"], ["foo"; "bar"]), ["afoo "; "bbbar"])
## test for mixing character and cell inputs
%!assert (strcat ("a", {"bc", "de"}, "f"), {"abcf", "adef"})
## test for scalar strings with vector strings
%!assert (strcat (["a"; "b"], "c"), ["ac"; "bc"])
## test with cells with strings of differing lengths
%!assert (all (strcmp (strcat ({"a", "bb"}, "ccc"), {"accc", "bbccc"})))
%!assert (all (strcmp (strcat ("a", {"bb", "ccc"}), {"abb", "accc"})))
## test with a single string or cell input
%!assert <*49094> (strcat ("foo "), "foo")
%!assert <*49094> (strcat ({"foo"}), {"foo"})
%!assert (strcat (1), char (1))
%!assert (strcat (1, 2), strcat (char (1), char (2)))
%!assert (strcat ("", 2), strcat ([], char (2)))
%!assert (strcat (), "")
|
