annotate scripts/strings/index.m @ 27985:9f9ac219896d

maint: Remove remaining "Author:" instances from code base. * __ftp__.cc, load-save.cc, urlwrite.cc, xnorm.cc, xnorm.h, cconv2.f, cdotc3.f, cmatm3.f, csconv2.f, dconv2.f, ddot3.f, dmatm3.f, sconv2.f, sdot3.f, smatm3.f, zconv2.f, zdconv2.f, zdotc3.f, zmatm3.f, crsf2csf.f, zrsf2csf.f, oct-norm.cc, oct-norm.h, lin2mu.m, mu2lin.m, bincoeff.m, blkdiag.m, deal.m, gradient.m, interpft.m, nextpow2.m, postpad.m, prepad.m, repmat.m, shift.m, xor.m, griddata.m, rotx.m, roty.m, rotz.m, voronoin.m, getappdata.m, isappdata.m, rmappdata.m, setappdata.m, colormap.m, gray.m, gray2ind.m, im2double.m, image.m, imagesc.m, imread.m, imshow.m, ind2gray.m, ind2rgb.m, ocean.m, __imread__.m, rgb2ind.m, javachk.m, ClassHelper.java, usejava.m, findstr.m, commutation_matrix.m, cross.m, gls.m, housh.m, isdefinite.m, ishermitian.m, issymmetric.m, logm.m, null.m, ols.m, orth.m, qzhess.m, rref.m, dos.m, nargoutchk.m, orderfields.m, parseparams.m, __w2mpth__.m, unix.m, untar.m, unzip.m, expand_rel_paths.m, make_rel_paths.m, daspect.m, orient.m, pbaspect.m, rticks.m, thetaticks.m, xticklabels.m, xticks.m, yticklabels.m, yticks.m, zticklabels.m, zticks.m, comet.m, contourf.m, plot3.m, cla.m, copyobj.m, findfigs.m, hdl2struct.m, linkaxes.m, __ghostscript__.m, __gnuplot_get_var__.m, __gnuplot_has_feature__.m, __gnuplot_has_terminal__.m, __gnuplot_open_stream__.m, __gnuplot_print__.m, struct2hdl.m, subplot.m, compan.m, conv.m, deconv.m, mpoles.m, poly.m, polyder.m, polyfit.m, polyint.m, polyout.m, polyreduce.m, polyval.m, polyvalm.m, residue.m, roots.m, ismember.m, __parse_movargs__.m, detrend.m, fftconv.m, fftfilt.m, fftshift.m, filter2.m, movfun.m, movslice.m, ichol.m, pcg.m, beta.m, ellipke.m, lcm.m, nchoosek.m, pow2.m, primes.m, pascal.m, rosser.m, wilkinson.m, corr.m, kurtosis.m, skewness.m, base2dec.m, bin2dec.m, blanks.m, deblank.m, dec2base.m, dec2bin.m, dec2hex.m, hex2dec.m, index.m, rindex.m, strjoin.m, substr.m, untabify.m, calendar.m, datestr.m, eomday.m, now.m, weekday.m: Remove remaining "Author:" instances from code base.
author Rik <rik@octave.org>
date Tue, 21 Jan 2020 14:35:03 -0800
parents 7f1cec12c240
children 28de41192f3c 0a5b15007766
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rev   line source
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 1996-2020 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {} index (@var{s}, @var{t})
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28 ## @deftypefnx {} {} index (@var{s}, @var{t}, @var{direction})
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29 ## Return the position of the first occurrence of the string @var{t} in the
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30 ## string @var{s}, or 0 if no occurrence is found.
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31 ##
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32 ## @var{s} may also be a string array or cell array of strings.
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33 ##
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34 ## For example:
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35 ##
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36 ## @example
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37 ## @group
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38 ## index ("Teststring", "t")
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39 ## @result{} 4
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40 ## @end group
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41 ## @end example
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42 ##
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43 ## If @var{direction} is @qcode{"first"}, return the first element found.
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44 ## If @var{direction} is @qcode{"last"}, return the last element found.
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45 ##
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46 ## @seealso{find, rindex}
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47 ## @end deftypefn
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48
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49 function n = index (s, t, direction = "first")
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50
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51 if (nargin < 2 || nargin > 3)
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52 print_usage ();
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53 endif
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54
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55 if (ischar (s))
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56 if (! isrow (s))
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57 s = cellstr (s); # Handle string arrays by conversion to cellstr
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58 endif
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59 elseif (! iscellstr (s))
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60 error ("index: S must be a string, string array, or cellstr");
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61 endif
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62
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63 f = strfind (s, t);
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64 if (isempty (f))
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65 f = 0;
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66 elseif (iscell (f))
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67 f(cellfun ("isempty", f)) = {0};
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68 endif
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69
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70 direction = tolower (direction);
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71
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72 if (strcmp (direction, "first"))
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73 if (iscell (f))
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74 n = cellfun ("min", f);
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75 else
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76 n = f(1);
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77 endif
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78 elseif (strcmp (direction, "last"))
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79 if (iscell (f))
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80 n = cellfun ("max", f);
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81 else
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82 n = f(end);
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83 endif
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84 else
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85 error ('index: DIRECTION must be either "first" or "last"');
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86 endif
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87
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88 endfunction
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89
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90
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91 %!assert (index ("foobarbaz", "b"), 4)
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92 %!assert (index ("foobarbaz", "z"), 9)
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93
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94 %!assert (index ("astringbstringcstring", "s"), 2)
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95 %!assert (index ("astringbstringcstring", "st"), 2)
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96 %!assert (index ("astringbstringcstring", "str"), 2)
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97 %!assert (index ("astringbstringcstring", "string"), 2)
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98 %!assert (index ("abc---", "abc+++"), 0)
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99
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100 ## test everything out in reverse
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101 %!assert (index ("astringbstringcstring", "s", "last"), 16)
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102 %!assert (index ("astringbstringcstring", "st", "last"), 16)
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103 %!assert (index ("astringbstringcstring", "str", "last"), 16)
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104 %!assert (index ("astringbstringcstring", "string", "last"), 16)
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105 %!assert (index ("abc---", "abc+++", "last"), 0)
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106
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107 %!test
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108 %! str = char ("Hello", "World", "Goodbye", "World");
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109 %! assert (index (str, "o"), [5; 2; 2; 2]);
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110 %! assert (index (str, "o", "last"), [5; 2; 3; 2]);
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111 %! str = cellstr (str);
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112 %! assert (index (str, "o"), [5; 2; 2; 2]);
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113 %! assert (index (str, "o", "last"), [5; 2; 3; 2]);
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114
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115 ## Test input validation
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116 %!error index ()
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117 %!error index ("a")
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118 %!error index ("a", "b", "first", "d")
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119 %!error index (1, "bar")
1a6537dbce7b Expand index,rindex functions to accept char array inputs
Rik <octave@nomad.inbox5.com>
parents: 12931
diff changeset
120 %!error index ("foo", "bar", 3)