annotate scripts/general/int2str.m @ 22323:bac0d6f07a3e

maint: Update copyright notices for 2016.
author John W. Eaton <jwe@octave.org>
date Wed, 17 Aug 2016 01:05:19 -0400
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1 ## Copyright (C) 1993-2016 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 {} {} 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 ## int2str (123)
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27 ## @result{} "123"
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28 ##
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29 ## s = int2str ([1, 2, 3; 4, 5, 6])
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30 ## @result{} s =
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31 ## 1 2 3
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32 ## 4 5 6
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33 ##
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34 ## whos s
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35 ## @result{}
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36 ## Attr Name Size Bytes Class
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37 ## ==== ==== ==== ===== =====
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38 ## s 2x7 14 char
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39 ## @end group
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40 ## @end example
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41 ##
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42 ## This function is not very flexible. For better control over the
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43 ## results, use @code{sprintf} (@pxref{Formatted Output}).
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44 ##
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45 ## Programming Notes:
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46 ##
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47 ## Non-integers are rounded to integers before display. Only the real part
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48 ## of complex numbers is displayed.
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49 ##
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50 ## @seealso{sprintf, num2str, mat2str}
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51 ## @end deftypefn
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52
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53 ## Author: jwe
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54
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55 function retval = int2str (n)
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56
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57 if (nargin != 1)
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58 print_usage ();
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59 elseif (! (isnumeric (n) || islogical (n) || ischar (n)))
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60 error ("int2str: N must be a numeric, logical, or character array");
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61 endif
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62
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63 if (ischar (n))
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64 retval = n;
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65 return;
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66 elseif (isempty (n))
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67 retval = "";
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68 return;
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69 endif
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71 n = round (real (n));
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72
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73 ## Set up a suitable format string while ignoring Inf/NaN entries
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74 nan_inf = ! isfinite (n(:));
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75 ndgt = floor (log10 (max (abs (n(! nan_inf)))));
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76 if (isempty (ndgt) || ndgt == -Inf)
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77 ndgt = 0; # All Inf or all zero array
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78 endif
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79
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80 ndgt += 3;
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81 if (any (nan_inf))
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82 ndgt = max (ndgt, 5);
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83 endif
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84
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85 ## FIXME: Integers should be masked to show only 16 significant digits
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86 fmt = sprintf ("%%%d.0f", ndgt);
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87
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88 nd = ndims (n);
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89 nc = columns (n) * (nd - 1); # ND-arrays are expanded in columns
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90 n = permute (n, [2, 3:nd, 1]);
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91 fmt = [repmat(fmt, 1, nc), "\n"];
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92 strtmp = sprintf (fmt, n);
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93 retval = strtrim (char (ostrsplit (strtmp, "\n", true)));
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94
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95 endfunction
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98 %!assert (int2str (123), "123")
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99 %!assert (int2str (-123), "-123")
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100 %!assert (int2str (1.2), "1")
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101 %!assert (int2str (1.6), "2")
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102 %!assert (int2str ([1, 2, 3; 4, 5, 6]), ["1 2 3";"4 5 6"])
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103 %!assert (int2str ([]), "")
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104
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105 %!error int2str ()
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106 %!error int2str (1, 2)
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107 %!error <N must be a numeric> int2str ({1})
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108