annotate scripts/strings/mat2str.m @ 16994:333243133364

Use matrix concatenation for strings, rather than cstrcat(), for clarity and performance. matrix concatenation is ~80% faster than cstrcat(). * doc/interpreter/strings.txi: Document preference for matrix concatenation as opposed to alternatives. * doc/interpreter/geometryimages.m, doc/interpreter/interpimages.m, doc/interpreter/plotimages.m, doc/interpreter/sparseimages.m, doc/interpreter/splineimages.m, scripts/general/genvarname.m, scripts/general/int2str.m, scripts/general/num2str.m, scripts/help/__makeinfo__.m, scripts/help/help.m, scripts/miscellaneous/copyfile.m, scripts/miscellaneous/dir.m, scripts/miscellaneous/edit.m, scripts/miscellaneous/fact.m, scripts/miscellaneous/fullfile.m, scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/movefile.m, scripts/miscellaneous/perl.m, scripts/miscellaneous/python.m, scripts/miscellaneous/run.m, scripts/miscellaneous/tempdir.m, scripts/miscellaneous/unpack.m, scripts/pkg/private/configure_make.m, scripts/pkg/private/create_pkgadddel.m, scripts/pkg/private/extract_pkg.m, scripts/pkg/private/get_description.m, scripts/pkg/private/get_forge_pkg.m, scripts/pkg/private/getarch.m, scripts/pkg/private/getarchprefix.m, scripts/pkg/private/install.m, scripts/pkg/private/installed_packages.m, scripts/pkg/private/load_packages_and_dependencies.m, scripts/pkg/private/rebuild.m, scripts/pkg/private/repackage.m, scripts/pkg/private/shell.m, scripts/pkg/private/uninstall.m, scripts/plot/private/__go_draw_axes__.m, scripts/signal/spectral_adf.m, scripts/signal/spectral_xdf.m, scripts/statistics/tests/z_test.m, scripts/statistics/tests/z_test_2.m, scripts/strings/mat2str.m, scripts/strings/strtok.m, scripts/testfun/__run_test_suite__.m, scripts/testfun/assert.m, scripts/testfun/demo.m, scripts/testfun/speed.m, scripts/testfun/test.m, test/eval-catch.tst, test/io.tst, test/try.tst: Replace cstrcat() with matrix concatenation where possible.
author Rik <rik@octave.org>
date Wed, 17 Jul 2013 14:02:32 -0700
parents 5d3a684236b0
children bc924baa2c4e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2002-2012 Rolf Fabian
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{s} =} mat2str (@var{x}, @var{n})
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21 ## @deftypefnx {Function File} {@var{s} =} mat2str (@var{x}, @var{n}, "class")
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22 ## Format real, complex, and logical matrices as strings. The
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23 ## returned string may be used to reconstruct the original matrix by using
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24 ## the @code{eval} function.
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25 ##
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26 ## The precision of the values is given by @var{n}. If @var{n} is a
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27 ## scalar then both real and imaginary parts of the matrix are printed
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28 ## to the same precision. Otherwise @code{@var{n}(1)} defines the
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29 ## precision of the real part and @code{@var{n}(2)} defines the
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30 ## precision of the imaginary part. The default for @var{n} is 15.
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31 ##
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32 ## If the argument "class" is given then the class of @var{x} is
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33 ## included in the string in such a way that @code{eval} will result in the
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34 ## construction of a matrix of the same class.
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35 ##
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36 ## @example
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37 ## @group
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38 ## mat2str ([ -1/3 + i/7; 1/3 - i/7 ], [4 2])
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39 ## @result{} "[-0.3333+0.14i;0.3333-0.14i]"
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40 ##
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41 ## mat2str ([ -1/3 +i/7; 1/3 -i/7 ], [4 2])
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42 ## @result{} "[-0.3333+0i 0+0.14i;0.3333+0i -0-0.14i]"
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43 ##
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44 ## mat2str (int16 ([1 -1]), "class")
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45 ## @result{} "int16([1 -1])"
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46 ##
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47 ## mat2str (logical (eye (2)))
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48 ## @result{} "[true false;false true]"
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49 ##
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50 ## isequal (x, eval (mat2str (x)))
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51 ## @result{} 1
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52 ## @end group
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53 ## @end example
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54 ##
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55 ## @seealso{sprintf, num2str, int2str}
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56 ## @end deftypefn
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57
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58 ## Author: Rolf Fabian <fabian@tu-cottbus.de>
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59
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60 function s = mat2str (x, n = 15, cls = "")
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61
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62 if (nargin < 1 || nargin > 3 || ! (isnumeric (x) || islogical (x)))
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63 print_usage ();
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64 elseif (ndims (x) > 2)
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65 error ("mat2str: X must be two dimensional");
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66 endif
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67
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68 if (nargin == 2 && ischar (n))
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69 cls = n;
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70 n = 15;
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71 elseif (isempty (n))
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72 n = 15; # Default precision
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73 endif
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74
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75 x_islogical = islogical (x);
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76 x_iscomplex = iscomplex (x);
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77
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78 if (x_iscomplex)
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79 if (isscalar (n))
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80 n = [n, n];
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81 endif
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82 fmt = sprintf ("%%.%dg%%+.%dgi", n(1), n(2));
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83 elseif (x_islogical)
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84 v = {"false", "true"};
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85 fmt = "%s";
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86 else
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87 fmt = sprintf ("%%.%dg", n(1));
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88 endif
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89
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90 nel = numel (x);
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91
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92 if (nel == 0)
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93 ## Empty, only print brackets
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94 s = "[]";
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95 elseif (nel == 1)
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96 ## Scalar X, don't print brackets
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97 if (x_iscomplex)
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98 s = sprintf (fmt, real (x), imag (x));
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99 elseif (x_islogical)
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100 s = v{x+1};
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101 else
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102 s = sprintf (fmt, x);
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103 endif
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104 else
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105 ## Non-scalar X, print brackets
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106 fmt = [fmt " "];
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107 if (x_iscomplex)
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108 t = x.';
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109 s = sprintf (fmt, [real(t(:))'; imag(t(:))']);
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110 elseif (x_islogical)
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111 t = v(x+1);
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112 s = cstrcat (sprintf (fmt, t{:}));
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113 else
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114 s = sprintf (fmt, x.');
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115 endif
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116
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117 s = ["[" s];
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118 s(end) = "]";
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119 idx = strfind (s, " ");
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120 nc = columns (x);
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121 s(idx(nc:nc:end)) = ";";
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122 endif
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123
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124 if (strcmp ("class", cls))
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125 s = [class(x) "(" s ")"];
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126 endif
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127
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128 endfunction
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131 %!assert (mat2str (0.7), "0.7")
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132 %!assert (mat2str (pi), "3.14159265358979")
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133 %!assert (mat2str (pi, 5), "3.1416")
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134 %!assert (mat2str (single (pi), 5, "class"), "single(3.1416)")
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135 %!assert (mat2str ([-1/3 + i/7; 1/3 - i/7], [4 2]), "[-0.3333+0.14i;0.3333-0.14i]")
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136 %!assert (mat2str ([-1/3 +i/7; 1/3 -i/7], [4 2]), "[-0.3333+0i 0+0.14i;0.3333+0i -0-0.14i]")
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137 %!assert (mat2str (int16 ([1 -1]), "class"), "int16([1 -1])")
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138 %!assert (mat2str (true), "true")
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139 %!assert (mat2str (false), "false")
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140 %!assert (mat2str (logical (eye (2))), "[true false;false true]")
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142 %% Test input validation
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143 %!error mat2str ()
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144 %!error mat2str (1,2,3,4)
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145 %!error mat2str (["Hello"])
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146 %!error <X must be two dimensional> mat2str (ones (3,3,2))
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