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mat2str.m: Use more modern code syntax for function * mat2str.m: Put input validation first in function. Add new tests. Update docstring.
author Rik <octave@nomad.inbox5.com>
date Tue, 20 Sep 2011 16:42:37 -0700
parents 708186085e0d
children da56d27164fe
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rev   line source
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1 ## Copyright (C) 2002-2011 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 numerical matrices as strings. This function
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23 ## returns values that are suitable for the use of the @code{eval}
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24 ## 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 ## @end group
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47 ## @end example
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48 ##
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49 ## @seealso{sprintf, num2str, int2str}
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50 ## @end deftypefn
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51
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52 ## Author: Rolf Fabian <fabian@tu-cottbus.de>
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53
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54 function s = mat2str (x, n, cls)
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55
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56 if (nargin < 1 || nargin > 3 || ! (isnumeric (x) || islogical (x)))
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57 print_usage ();
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58 endif
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59
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60 if (ndims (x) > 2)
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61 error ("mat2str: X must be two dimensional");
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62 endif
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63
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64 if (nargin < 2 || isempty (n))
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65 n = 15; # Default precision
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66 endif
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67
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68 if (nargin < 3)
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69 if (ischar (n))
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70 cls = n;
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71 n = 15;
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72 else
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73 cls = "";
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74 endif
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75 endif
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76
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77 x_islogical = islogical (x);
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78 x_iscomplex = iscomplex (x);
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79
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80 if (x_iscomplex)
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81 if (length (n) == 1)
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82 n = [n, n];
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83 endif
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84 fmt = sprintf ("%%.%dg%%+.%dgi", n(1), n(2));
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85 elseif (x_islogical)
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86 v = {"false", "true"};
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87 fmt = "%s";
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88 else
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89 fmt = sprintf ("%%.%dg", n(1));
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90 endif
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91
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92 nel = numel (x);
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93
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94 if (nel == 0)
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95 ## Empty, only print brackets
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96 s = "[]";
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97 elseif (nel == 1)
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98 ## Scalar X, don't print brackets
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99 if (x_iscomplex)
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100 s = sprintf (fmt, real (x), imag (x));
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101 elseif (x_islogical)
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102 s = v{x+1};
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103 else
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104 s = sprintf (fmt, x);
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105 endif
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106 else
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107 ## Non-scalar X, print brackets
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108 fmt = cstrcat (fmt, ",");
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109 if (x_iscomplex)
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110 t = x.';
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111 s = sprintf (fmt, [real(t(:))'; imag(t(:))']);
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112 elseif (x_islogical)
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113 t = v(x+1);
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114 s = cstrcat (sprintf (fmt, t{:}));
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115 else
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116 s = sprintf (fmt, x.');
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117 endif
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118
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119 s = cstrcat ("[", s);
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120 s(end) = "]";
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121 idx = find (s == ",");
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122 nc = columns (x);
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123 s(idx(nc:nc:end)) = ";";
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124 endif
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125
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126 if (strcmp ("class", cls))
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127 s = cstrcat (class (x), "(", s, ")");
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128 endif
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129
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130 endfunction
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131
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132
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133 %!assert (mat2str (0.7), "0.7");
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134 %!assert (mat2str (pi), "3.14159265358979");
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135 %!assert (mat2str (pi, 5), "3.1416");
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136 %!assert (mat2str (single (pi), 5, "class"), "single(3.1416)");
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137 %!assert (mat2str ([-1/3 + i/7; 1/3 - i/7], [4 2]), "[-0.3333+0.14i;0.3333-0.14i]")
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138 %!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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139 %!assert (mat2str (int16 ([1 -1]), 'class'), "int16([1,-1])")
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John W. Eaton <jwe@octave.org>
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140 %!assert (mat2str (true), "true");
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John W. Eaton <jwe@octave.org>
parents: 10793
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141 %!assert (mat2str (false), "false");
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John W. Eaton <jwe@octave.org>
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142 %!assert (mat2str (logical (eye (2))), "[true,false;false,true]");
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Rik <octave@nomad.inbox5.com>
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143
c215352ddb4f mat2str.m: Use more modern code syntax for function
Rik <octave@nomad.inbox5.com>
parents: 12611
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144 %% Test input validation
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145 %!error mat2str ()
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parents: 12611
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146 %!error mat2str (1,2,3,4)
c215352ddb4f mat2str.m: Use more modern code syntax for function
Rik <octave@nomad.inbox5.com>
parents: 12611
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147 %!error mat2str (["Hello"])
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parents: 12611
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148 %!error mat2str (ones(3,3,2))
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parents: 12611
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149