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mat2str: handle logical arguments
author John W. Eaton <jwe@octave.org>
date Wed, 12 Jan 2011 01:15:23 -0500
parents be55736a0783
children fd0a3ac60b0e
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1 ## Copyright (C) 2002, 2006, 2007, 2008, 2009 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 (@dots{}, 'class')
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22 ##
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23 ## Format real/complex numerical matrices as strings. This function
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24 ## returns values that are suitable for the use of the @code{eval}
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25 ## function.
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26 ##
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27 ## The precision of the values is given by @var{n}. If @var{n} is a
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28 ## scalar then both real and imaginary parts of the matrix are printed
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29 ## to the same precision. Otherwise @code{@var{n} (1)} defines the
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30 ## precision of the real part and @code{@var{n} (2)} defines the
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31 ## precision of the imaginary part. The default for @var{n} is 17.
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32 ##
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33 ## If the argument 'class' is given, then the class of @var{x} is
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34 ## included in the string in such a way that the eval will result in the
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35 ## construction of a matrix of the same class.
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36 ##
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37 ## @example
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38 ## @group
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39 ## mat2str ([ -1/3 + i/7; 1/3 - i/7 ], [4 2])
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40 ## @result{} "[-0.3333+0.14i;0.3333-0.14i]"
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41 ##
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42 ## mat2str ([ -1/3 +i/7; 1/3 -i/7 ], [4 2])
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43 ## @result{} "[-0.3333+0i,0+0.14i;0.3333+0i,-0-0.14i]"
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44 ##
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45 ## mat2str (int16([1 -1]), 'class')
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46 ## @result{} "int16([1,-1])"
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47 ## @end group
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48 ## @end example
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49 ##
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50 ## @seealso{sprintf, num2str, int2str}
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51 ## @end deftypefn
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52
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53 ## Author: Rolf Fabian <fabian@tu-cottbus.de>
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54
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55 function s = mat2str (x, n, cls)
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56
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57 if (nargin < 2 || isempty (n))
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58 ## Default precision
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59 n = 17;
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60 endif
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61
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62 if (nargin < 3)
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63 if (ischar (n))
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64 cls = n;
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65 n = 17;
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66 else
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67 cls = "";
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68 endif
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69 endif
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70
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71 if (nargin < 1 || nargin > 3 || ! (isnumeric (x) || islogical (x)))
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72 print_usage ();
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73 endif
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74
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75 if (ndims (x) > 2)
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76 error ("mat2str: X must be two dimensional");
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77 endif
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78
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79 x_islogical = islogical (x);
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80 x_iscomplex = iscomplex (x);
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81
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82 if (x_iscomplex)
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83 if (length (n) == 1)
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84 n = [n, n];
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85 endif
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86 fmt = sprintf ("%%.%dg%%+.%dgi", n(1), n(2));
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87 elseif (x_islogical)
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88 v = {"false", "true"};
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89 fmt = "%s";
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90 else
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91 fmt = sprintf ("%%.%dg", n(1));
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92 endif
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93
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94 nel = numel (x);
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95
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96 if (nel == 0)
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97 ## Empty, only print brackets
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98 s = "[]";
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99 elseif (nel == 1)
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100 ## Scalar X, don't print brackets
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101 if (x_iscomplex)
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102 s = sprintf (fmt, real (x), imag (x));
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103 elseif (x_islogical)
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104 s = v{x+1};
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105 else
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106 s = sprintf (fmt, x);
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107 endif
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108 else
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109 ## Non-scalar X, print brackets
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110 fmt = cstrcat (fmt, ",");
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111 if (x_iscomplex)
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112 t = x.';
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113 s = sprintf (fmt, [real(t(:))'; imag(t(:))']);
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114 elseif (x_islogical)
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115 t = v(x+1);
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116 s = cstrcat (sprintf (fmt, t{:}));
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117 else
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118 s = sprintf (fmt, x.');
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119 endif
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120
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121 s = cstrcat ("[", s);
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122 s(end) = "]";
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123 ind = find (s == ",");
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124 nc = columns (x);
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125 s(ind(nc:nc:end)) = ";";
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126 endif
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127
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128 if (strcmp ("class", cls))
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129 s = cstrcat (class(x), "(", s, ")");
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130 endif
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131 endfunction
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132
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133 %!assert (mat2str ([-1/3 + i/7; 1/3 - i/7], [4 2]), "[-0.3333+0.14i;0.3333-0.14i]")
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134 %!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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135 %!assert (mat2str (int16 ([1 -1]), 'class'), "int16([1,-1])")
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136
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137 %!assert (mat2str (true), "true");
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138 %!assert (mat2str (false), "false");
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139 %!assert (mat2str (logical (eye (2))), "[true,false;false,true]");