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properly compress sparse matrices after assembly
author Jaroslav Hajek <highegg@gmail.com>
date Mon, 12 Apr 2010 12:57:44 +0200
parents e60f038146e1
children 693e22af08ae
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1 ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003,
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2 ## 2005, 2006, 2007, 2008, 2009 John W. Eaton
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3 ## Copyright (C) 2009 Jaroslav Hajek
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4 ##
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5 ## This file is part of Octave.
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6 ##
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7 ## Octave is free software; you can redistribute it and/or modify it
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8 ## under the terms of the GNU General Public License as published by
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9 ## the Free Software Foundation; either version 3 of the License, or (at
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10 ## your option) any later version.
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11 ##
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12 ## Octave is distributed in the hope that it will be useful, but
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13 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 ## General Public License for more details.
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16 ##
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17 ## You should have received a copy of the GNU General Public License
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18 ## along with Octave; see the file COPYING. If not, see
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19 ## <http://www.gnu.org/licenses/>.
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20
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21 ## -*- texinfo -*-
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22 ## @deftypefn {Function File} {} strcat (@var{s1}, @var{s2}, @dots{})
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23 ## Return a string containing all the arguments concatenated
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24 ## horizontally. If the arguments are cells strings, @code{strcat}
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25 ## returns a cell string with the individual cells concatenated.
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26 ## For numerical input, each element is converted to the
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27 ## corresponding ASCII character. Trailing white space is eliminated.
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28 ## For example,
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29 ##
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30 ## @example
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31 ## @group
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32 ## s = [ "ab"; "cde" ];
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33 ## strcat (s, s, s)
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34 ## @result{} ans =
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35 ## "ab ab ab "
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36 ## "cdecdecde"
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37 ## @end group
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38 ## @end example
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39 ##
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40 ## @example
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41 ## @group
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42 ## s = @{ "ab"; "cde" @};
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43 ## strcat (s, s, s)
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44 ## @result{} ans =
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45 ## @{
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46 ## [1,1] = ababab
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47 ## [2,1] = cdecdecde
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48 ## @}
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49 ## @end group
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50 ## @end example
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51 ##
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52 ## @seealso{cstrcat, char, strvcat}
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53 ## @end deftypefn
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54
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55 ## Author: jwe
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56
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57 function st = strcat (varargin)
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58
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59 if (nargin > 0)
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60 if (nargin == 1)
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61 st = varargin{1};
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62 elseif (nargin > 1)
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63 ## Convert to cells of strings
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64 uo = "UniformOutput";
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65 reals = cellfun (@isreal, varargin);
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66 if (any (reals))
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67 varargin(reals) = cellfun (@char, varargin(reals), uo, false);
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68 endif
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69 chars = cellfun (@ischar, varargin);
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70 allchar = all (chars);
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71 varargin(chars) = cellfun (@cellstr, varargin(chars), uo, false);
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72 if (! all (cellfun (@iscell, varargin)))
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73 error ("strcat: inputs must be strings or cells of strings");
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74 endif
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75
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76 ## We don't actually need to bring all cells to common size, because
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77 ## cellfun can now expand scalar cells.
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78 err = common_size (varargin{:});
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79
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80 if (err)
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81 error ("strcat: arguments must be the same size, or be scalars");
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82 endif
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83
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84 ## Cellfun handles everything for us.
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85 st = cellfun (@horzcat, varargin{:}, uo, false);
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86
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87 if (allchar)
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88 ## If all inputs were strings, return strings.
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89 st = char (st);
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90 endif
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91 endif
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92 else
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93 print_usage ();
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94 endif
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95
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96 endfunction
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97
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98 ## test the dimensionality
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99 ## 1d
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100 %!assert(strcat("ab ", "ab "), "abab")
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101 %!assert(strcat({"ab "}, "ab "), {"ab ab"})
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102 %!assert(strcat("ab ", {"ab "}), {"abab "})
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103 %!assert(strcat({"ab "}, {"ab "}), {"ab ab "})
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104 %!assert(strcat("", "ab"), "ab")
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105 %!assert(strcat("", {"ab"}, {""}), {"ab"})
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106 ## 2d
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107 %!assert(strcat(["ab ";"cde"], ["ab ";"cde"]), ["abab ";"cdecde"])
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108
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109 ## test for deblanking implied trailing spaces of character input
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110 %!assert((strcmp (strcat ("foo", "bar"), "foobar") &&
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111 %! strcmp (strcat (["a"; "bb"], ["foo"; "bar"]), ["afoo "; "bbbar"])));
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112
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113 ## test for mixing character and cell inputs
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114 %!assert(all (strcmp (strcat ("a", {"bc", "de"}, "f"), {"abcf", "adef"})))
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115
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116 ## test for scalar strings with vector strings
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117 %!assert(all (strcmp (strcat (["a"; "b"], "c"), ["ac"; "bc"])))
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118
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119 ## test with cells with strings of differing lengths
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120 %!assert(all (strcmp (strcat ({"a", "bb"}, "ccc"), {"accc", "bbccc"})))
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121 %!assert(all (strcmp (strcat ("a", {"bb", "ccc"}), {"abb", "accc"})))
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122
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123 %!error strcat ();
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124
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125 %!assert (strcat (1, 2), strcat (char(1), char(2)))
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126
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127 %!assert (strcat ('', 2), strcat ([], char(2)))
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128