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annotate scripts/general/int2str.m @ 12780:c99714aeb008

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int2str.m: Return "" for null input []. (Bug #33524) int2str.m: Return "" for null input [].
author Rik <octave@nomad.inbox5.com>
date Wed, 13 Jul 2011 17:28:26 -0700
parents 2783fa95cab7
children 72c96de7a403
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1993-2011 John W. Eaton
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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} {} int2str (@var{n})
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21 ## Convert an integer (or array of integers) to a string (or a character
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22 ## array).
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23 ##
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24 ## @example
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25 ## @group
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26 ##
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27 ## int2str (123)
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28 ## @result{} "123"
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29 ##
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30 ## s = int2str ([1, 2, 3; 4, 5, 6])
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31 ## @result{} s =
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32 ## 1 2 3
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33 ## 4 5 6
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34 ##
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35 ## whos s
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36 ## @result{} s =
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37 ## Attr Name Size Bytes Class
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38 ## ==== ==== ==== ===== =====
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39 ## s 2x7 14 char
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40 ## @end group
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41 ## @end example
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42 ##
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43 ## This function is not very flexible. For better control over the
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44 ## results, use @code{sprintf} (@pxref{Formatted Output}).
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45 ## @seealso{sprintf, num2str, mat2str}
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46 ## @end deftypefn
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47
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48 ## Author: jwe
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49
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50 function retval = int2str (n)
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51
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52 if (nargin != 1)
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53 print_usage ();
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54 endif
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55
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56 if (isempty (n))
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57 retval = '';
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58 return;
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59 endif
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60
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61 n = round (real(n));
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62 sz = size(n);
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63 nd = ndims (n);
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64 nc = columns (n);
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65 if (nc > 1)
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66 idx = repmat ({':'}, nd, 1);
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67 idx(2) = 1;
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68 ifmt = get_fmt (n(idx{:}), 0);
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69 idx(2) = 2:sz(2);
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70 rfmt = get_fmt (n(idx{:}), 2);
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71 fmt = cstrcat (ifmt, repmat (rfmt, 1, nc-1), "\n");
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72 else
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73 fmt = cstrcat (get_fmt (n, 0), "\n");
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74 endif
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75 tmp = sprintf (fmt, permute (n, [2, 1, 3 : nd]));
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76 tmp(end) = "";
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77 retval = char (strsplit (tmp, "\n"));
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78
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79 endfunction
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80
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81 function fmt = get_fmt (x, sep)
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82
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83 t = x(:);
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84 t = t(t != 0);
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85 if (isempty (t))
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86 ## All zeros.
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87 fmt = sprintf ("%%%dd", 1 + sep);
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88 else
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89 ## Maybe have some zeros.
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90 nan_inf = isinf (t) | isnan (t);
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91 if (any (nan_inf))
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92 if (any (t(nan_inf) < 0))
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93 min_fw = 4 + sep;
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94 else
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95 min_fw = 3 + sep;
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96 endif
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97 else
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98 min_fw = 1 + sep;
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99 endif
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100 t = t(! nan_inf);
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101 if (isempty (t))
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102 ## Only zeros, Inf, and NaN.
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103 fmt = sprintf ("%%%dd", min_fw);
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104 else
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105 ## Could have anything.
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106 tfw = floor (log10 (double (abs (t)))) + 1 + sep;
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107 fw = max (tfw);
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108 if (any (t(tfw == fw) < 0))
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109 fw++;
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110 endif
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111 fmt = sprintf ("%%%dd", max (fw, min_fw));
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112 endif
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113 endif
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114
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115 endfunction
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116
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117 %!assert (strcmp (int2str (-123), "-123") && strcmp (int2str (1.2), "1"));
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118 %!assert (all (int2str ([1, 2, 3; 4, 5, 6]) == ["1 2 3";"4 5 6"]));
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119 %!assert (int2str([]), "");
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120
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121 %!error int2str ();
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122 %!error int2str (1, 2);
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123