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1 /* |
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2 |
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3 Copyright (C) 2007 David Bateman <dbateman@free.fr> |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #include <iostream> |
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25 #include <fstream> |
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26 #include <cmath> |
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27 #include <string> |
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28 |
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29 #ifdef HAVE_CONFIG_H |
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30 #include <config.h> |
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31 #endif |
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32 |
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33 #include "oct.h" |
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34 |
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35 DEFUN_DLD (__dsearchn__, args, , |
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36 "-*- texinfo -*-\n\ |
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37 @deftypefn {Loadable Function} {[@var{idx}, @var{d}] =} dsearch (@var{x}, @var{xi})\n\ |
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38 Internal function for dsearchn.\n\ |
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39 @end deftypefn") |
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40 { |
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41 int nargin = args.length(); |
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42 octave_value_list retval; |
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43 |
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44 if (nargin != 2) |
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45 { |
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46 print_usage (); |
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47 return retval; |
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48 } |
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49 |
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50 Matrix x = args(0).matrix_value().transpose (); |
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51 Matrix xi = args(1).matrix_value().transpose (); |
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52 |
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53 if (! error_state) |
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54 { |
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55 if (x.rows() != xi.rows() || x.columns() < 1) |
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56 error ("__dsearch__: dimensional mismatch."); |
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57 else |
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58 { |
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59 octave_idx_type n = x.rows(); |
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60 octave_idx_type nx = x.columns(); |
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61 octave_idx_type nxi = xi.columns(); |
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62 |
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63 ColumnVector idx (nxi); |
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64 double *pidx = idx.fortran_vec (); |
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65 ColumnVector dist (nxi); |
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66 double *pdist = dist.fortran_vec (); |
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67 |
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68 #define DIST(dd, y, yi, m) \ |
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69 dd = 0.; \ |
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70 for (octave_idx_type k = 0; k < m; k++) \ |
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71 { \ |
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72 double yd = y[k] - yi[k]; \ |
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73 dd += yd * yd; \ |
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74 } \ |
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75 dd = sqrt (dd); |
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76 |
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77 const double *pxi = xi.fortran_vec (); |
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78 for (octave_idx_type i = 0; i < nxi; i++) |
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79 { |
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80 double d0; |
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81 const double *px = x.fortran_vec (); |
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82 DIST(d0, px, pxi, n); |
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83 *pidx = 1.; |
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84 for (octave_idx_type j = 1; j < nx; j++) |
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85 { |
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86 px += n; |
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87 double d; |
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88 DIST (d, px, pxi, n); |
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89 if (d < d0) |
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90 { |
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91 d0 = d; |
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92 *pidx = static_cast<double>(j + 1); |
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93 } |
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94 OCTAVE_QUIT; |
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95 } |
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96 |
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97 *pdist++ = d0; |
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98 pidx++; |
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99 pxi += n; |
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100 } |
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101 |
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102 retval(1) = dist; |
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103 retval(0) = idx; |
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104 } |
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105 } |
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106 |
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107 return retval; |
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108 } |
