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annotate libinterp/corefcn/levenshtein.cc @ 20583:d746695bf494

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levenshtein.cc: use Array<T>::numel() instead of the deprecated ::length()
author Carnë Draug <carandraug@octave.org>
date Sun, 04 Oct 2015 16:24:32 +0100
parents fcb792acab9b
children f90c8372b7ba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
20568
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1 /*
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2
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3 Copyright (C) 2014 Jacopo Corno
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4 Copyright (C) 2014 Carlo de Falco
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5 Copyright (C) 2013 Roberto Porcu
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6 Copyright (C) 2013 Mattia Penati
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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 (at
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13 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 GNU
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18 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 <http://www.gnu.org/licenses/>.
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23
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24 */
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25
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26 #ifdef HAVE_CONFIG_H
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27 #include <config.h>
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28 #endif
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29
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30 #include "defun.h"
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31
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32 #define MIN2(A,B) ((A)<(B)?(A):(B))
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33 #define MIN3(A,B,C) (MIN2(MIN2((A),(B)),(C)))
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34
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35 DEFUN (levenshtein, args, nargout,
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36 "-*- texinfo -*-\n\
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37 @deftypefn {Loadable Function} {@var{d} =} levenshtein (@var{str1}, @var{str2}, [@var{u_bound}])\n \
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38 @deftypefnx {Loadable Function} {[@var{d}, @var{mat}] =} levenshtein (@var{str1}, @var{str2}, [@var{u_bound}])\n \
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39 This function file computes the Levenshtein distance between two strings. More details at @url{http://en.wikipedia.org/wiki/Levenshtein_distance}.\n \
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40 This function can be called with one or two output arguments: @var{d} is the distance between the two strings and @var{mat} is the matrix computed by Levenshtein algorithm.\n \
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41 The first and the second input arguments, @var{str1} and @var{str2}, are the two strings to be compared. This comparison is case-sensitive.\n \
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42 The third argument @var{u_bound} is optional and fixes an upper bound for the distance. If the distance is greater than this limit then the function ends and returns a value equal to Inf.\n \
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43 @seealso{odeset}\n\
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44 @end deftypefn")
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45 {
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46 octave_value_list retval;
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47 int nargin = args.length ();
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48 octave_idx_type ub;
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49
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50 if (nargin < 2
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51 || nargin > 3
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52 || nargout > 2)
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53 {
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54 print_usage ();
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55 return retval;
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56 }
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57
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58 if (nargin == 3)
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59 ub = args(2).idx_type_value ();
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60 else
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61 ub = std::numeric_limits<int32_t>::max ();
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62
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63 Array<char> s1 (args(0).char_array_value ());
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64 char *s1_p = s1.fortran_vec ();
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65
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66 Array<char> s2 (args(1).char_array_value ());
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67 char *s2_p = s2.fortran_vec ();
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68
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69 octave_idx_type
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70 s1len = s1.numel (),
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71 s2len = s2.numel (),
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72 ii, jj;
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73
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74 if (! error_state)
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75 {
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76 Array<octave_idx_type>
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77 dist (dim_vector (s1len + 1, s2len + 1), 0);
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78
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79 for (ii = 1; ii <= s1len; ii++)
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80 dist.xelem (ii, 0) = ii;
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81
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82 for (jj = 1; jj <= s2len; jj++)
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83 dist.xelem (0, jj) = jj;
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84
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85 for (jj = 1; jj <= s2len; jj++)
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86 {
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87 for (ii = 1; ii <= s1len; ii++)
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88 if (s1_p[ii-1] == s2_p[jj-1])
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89 dist.xelem (ii, jj) = dist.xelem (ii-1, jj-1);
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90 else
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91 dist.xelem (ii, jj) =
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92 MIN3(dist.xelem (ii-1, jj) + 1,
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93 dist.xelem (ii, jj-1) + 1,
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94 dist.xelem (ii-1, jj-1) + 1);
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95
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96 if (dist(MIN2(jj, s1len), jj) > ub)
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97 {
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98 retval(0) = std::numeric_limits<int32_t>::max ();
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99 if (nargout == 2)
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100 retval(1) = Matrix ();
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101 return retval;
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102 }
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103 }
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104 retval(0) = dist.xelem (s1len, s2len);
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105 if (nargout == 2)
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106 retval(1) = dist;
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107 }
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108 return retval;
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109 }