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annotate scripts/time/datevec.m @ 18919:9eb72fa5f8b5

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datevec.m: Return value with same shape as input (bug #42334). datevec.m: If input is not a row vector, record size of input and restore with reshape at end of function. Add input validation tests.
author Sergey Plotnikov <seryozha.plotnikov@gmail.com>
date Sun, 11 May 2014 17:14:10 -0700
parents d63878346099
children 38925538ec14
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rev   line source
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d63878346099 maint: Update copyright notices for release.
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2000-2013 Paul Kienzle
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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} {@var{v} =} datevec (@var{date})
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21 ## @deftypefnx {Function File} {@var{v} =} datevec (@var{date}, @var{f})
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22 ## @deftypefnx {Function File} {@var{v} =} datevec (@var{date}, @var{p})
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23 ## @deftypefnx {Function File} {@var{v} =} datevec (@var{date}, @var{f}, @var{p})
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24 ## @deftypefnx {Function File} {[@var{y}, @var{m}, @var{d}, @var{h}, @var{mi}, @var{s}] =} datevec (@dots{})
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25 ## Convert a serial date number (see @code{datenum}) or date string (see
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26 ## @code{datestr}) into a date vector.
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27 ##
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28 ## A date vector is a row vector with six members, representing the year,
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29 ## month, day, hour, minute, and seconds respectively.
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30 ##
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31 ## @var{f} is the format string used to interpret date strings
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32 ## (see @code{datestr}). If @var{date} is a string, but no format is
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33 ## specified, then a relatively slow search is performed through various
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34 ## formats. It is always preferable to specify the format string @var{f}
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35 ## if it is known. Formats which do not specify a particular time component
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36 ## will have the value set to zero. Formats which do not specify a date will
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37 ## default to January 1st of the current year.
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38 ##
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39 ## @var{p} is the year at the start of the century to which two-digit years
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40 ## will be referenced. If not specified, it defaults to the current year
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41 ## minus 50.
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42 ## @seealso{datenum, datestr, clock, now, date}
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43 ## @end deftypefn
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44
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45 ## Algorithm: Peter Baum (http://vsg.cape.com/~pbaum/date/date0.htm)
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46
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47 ## Author: pkienzle <pkienzle@users.sf.net>
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48 ## Modified: bdenney <bill@givebillmoney.com>
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49 ## Created: 10 October 2001 (CVS)
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50 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com>
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51
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52 ## The function __date_str2vec__ is based on datesplit by Bill Denney.
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53
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54 function [y, m, d, h, mi, s] = datevec (date, f = [], p = [])
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55
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56 persistent std_formats nfmt;
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57
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58 if (isempty (std_formats))
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59 std_formats = cell ();
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60 nfmt = 0;
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61 ## These formats are specified by Matlab documentation to be parsed
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62 ## The '# XX' refers to the datestr numerical format code
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63 std_formats{++nfmt} = "dd-mmm-yyyy HH:MM:SS"; # 0
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64 std_formats{++nfmt} = "dd-mmm-yyyy"; # 1
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65 std_formats{++nfmt} = "mm/dd/yy"; # 2
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66 std_formats{++nfmt} = "mm/dd"; # 6
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67 std_formats{++nfmt} = "HH:MM:SS"; # 13
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68 std_formats{++nfmt} = "HH:MM:SS PM"; # 14
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69 std_formats{++nfmt} = "HH:MM"; # 15
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70 std_formats{++nfmt} = "HH:MM PM"; # 16
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71 std_formats{++nfmt} = "mm/dd/yyyy"; # 23
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72
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73 ## These formats are undocumented but parsed by Matlab
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74 std_formats{++nfmt} = "mmmyy"; # 12
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75 std_formats{++nfmt} = "mmm.dd,yyyy HH:MM:SS"; # 21
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76 std_formats{++nfmt} = "mmm.dd,yyyy"; # 22
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77 std_formats{++nfmt} = "yyyy/mm/dd"; # 26
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78 std_formats{++nfmt} = "yyyy-mm-dd"; # 29
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79 std_formats{++nfmt} = "yyyy-mm-dd HH:MM:SS"; # 31
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80
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81 ## These are other formats that Octave tries
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82 std_formats{++nfmt} = "mmm-dd-yyyy HH:MM:SS";
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83 std_formats{++nfmt} = "mmm-dd-yyyy";
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84 std_formats{++nfmt} = "dd mmm yyyy HH:MM:SS";
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85 std_formats{++nfmt} = "dd mmm yyyy";
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86 std_formats{++nfmt} = "mmm dd yyyy HH:MM:SS";
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87 std_formats{++nfmt} = "mmm dd yyyy";
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88 std_formats{++nfmt} = "dd.mmm.yyyy HH:MM:SS";
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89 std_formats{++nfmt} = "dd.mmm.yyyy";
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90 std_formats{++nfmt} = "mmm.dd.yyyy HH:MM:SS";
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91 std_formats{++nfmt} = "mmm.dd.yyyy";
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92 std_formats{++nfmt} = "mm/dd/yyyy HH:MM";
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93 endif
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94
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95 if (nargin < 1 || nargin > 3)
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96 print_usage ();
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97 endif
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98
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99 if (ischar (date))
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100 date = cellstr (date);
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101 endif
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102
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103 if (isnumeric (f))
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104 p = f;
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105 f = [];
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106 endif
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107
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108 if (isempty (f))
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109 f = -1;
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110 endif
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111
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112 if (isempty (p))
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113 p = (localtime (time ())).year + 1900 - 50;
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114 endif
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115
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116 do_resize = false;
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117
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118 if (iscell (date))
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119
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120 nd = numel (date);
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121
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122 y = m = d = h = mi = s = zeros (nd, 1);
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123
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124 if (f == -1)
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125 for k = 1:nd
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126 found = false;
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127 for l = 1:nfmt
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128 [f, rY, ry, fy, fm, fd, fh, fmi, fs] = __date_vfmt2sfmt__ (std_formats{l});
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129 [found y(k) m(k) d(k) h(k) mi(k) s(k)] = __date_str2vec__ (date{k}, p, f, rY, ry, fy, fm, fd, fh, fmi, fs);
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130 if (found)
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131 break;
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132 endif
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133 endfor
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134 if (! found)
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135 error ("datevec: none of the standard formats match the DATE string");
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136 endif
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137 endfor
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138 else
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139 ## Decipher the format string just once for speed.
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140 [f, rY, ry, fy, fm, fd, fh, fmi, fs] = __date_vfmt2sfmt__ (f);
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141 for k = 1:nd
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142 [found y(k) m(k) d(k) h(k) mi(k) s(k)] = __date_str2vec__ (date{k}, p, f, rY, ry, fy, fm, fd, fh, fmi, fs);
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143 if (! found)
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144 error ("datevec: DATE not parsed correctly with given format");
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145 endif
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146 endfor
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147 endif
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148
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149 else # datenum input
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150
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151 if (! isrow (date))
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152 date_sz = size (date);
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153 do_resize = true;
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154 endif
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155 date = date(:);
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156
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157 ## Move day 0 from midnight -0001-12-31 to midnight 0000-3-1
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158 z = floor (date) - 60;
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159 ## Calculate number of centuries; K1 = 0.25 is to avoid rounding problems.
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160 a = floor ((z - 0.25) / 36524.25);
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161 ## Days within century; K2 = 0.25 is to avoid rounding problems.
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162 b = z - 0.25 + a - floor (a / 4);
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163 ## Calculate the year (year starts on March 1).
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164 y = floor (b / 365.25);
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165 ## Calculate day in year.
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166 c = fix (b - floor (365.25 * y)) + 1;
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167 ## Calculate month in year.
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168 m = fix ((5 * c + 456) / 153);
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169 d = c - fix ((153 * m - 457) / 5);
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170 ## Move to Jan 1 as start of year.
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171 ++y(m > 12);
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172 m(m > 12) -= 12;
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173
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174 ## Convert hour-minute-seconds. Attempt to account for precision of
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175 ## datenum format.
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176
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177 fracd = date - floor (date);
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178 tmps = abs (eps*86400*date);
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179 tmps(tmps == 0) = 1;
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180 srnd = 2 .^ floor (- log2 (tmps));
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181 s = round (86400 * fracd .* srnd) ./ srnd;
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182 h = floor (s / 3600);
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183 s = s - 3600 * h;
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184 mi = floor (s / 60);
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185 s = s - 60 * mi;
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186
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187 endif
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188
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189 if (nargout <= 1)
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190 y = [y, m, d, h, mi, s];
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191 elseif (do_resize)
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192 y = reshape (y, date_sz);
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193 m = reshape (m, date_sz);
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194 d = reshape (d, date_sz);
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195 h = reshape (h, date_sz);
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196 mi = reshape (mi, date_sz);
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197 s = reshape (s, date_sz);
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198 endif
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199
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200 endfunction
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201
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202 function [f, rY, ry, fy, fm, fd, fh, fmi, fs] = __date_vfmt2sfmt__ (f)
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203
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204 ## Play safe with percent signs.
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205 f = strrep (f, "%", "%%");
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206
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207 if (! isempty (strfind (f, "PM")) || ! isempty (strfind (f, "AM")))
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208 ampm = true;
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209 else
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210 ampm = false;
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211 endif
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212
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213 ## Date part.
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214 f = regexprep (f, '[Yy][Yy][Yy][Yy]', "%Y");
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215 f = regexprep (f, '[Yy][Yy]', "%y");
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216 f = strrep (f, "mmmm", "%B");
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217 f = strrep (f, "mmm", "%b");
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218 f = strrep (f, "mm", "%m");
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219 f = regexprep (f, '[Dd][Dd][Dd][Dd]', "%A");
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220 f = regexprep (f, '[Dd][Dd][Dd]', "%a");
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221 f = regexprep (f, '[Dd][Dd]', "%d");
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222
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223 ## Time part.
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224 if (ampm)
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225 f = strrep (f, "HH", "%I");
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226 f = strrep (f, "PM", "%p");
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227 f = strrep (f, "AM", "%p");
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228 else
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229 f = strrep (f, "HH", "%H");
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230 endif
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231 f = strrep (f, "MM", "%M");
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232 f = regexprep (f, '[Ss][Ss]', "%S");
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233
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234 rY = rindex (f, "%Y");
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235 ry = rindex (f, "%y");
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236
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237 ## Check whether we need to give default values.
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238 ## Possible error when string contains "%%".
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239 fy = rY || ry;
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240 fm = index (f, "%m") || index (f, "%b") || index (f, "%B");
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241 fd = index (f, "%d") || index (f, "%a") || index (f, "%A");
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242 fh = index (f, "%H") || index (f, "%I");
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243 fmi = index (f, "%M");
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244 fs = index (f, "%S");
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245
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246 endfunction
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247
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248 function [found, y, m, d, h, mi, s] = __date_str2vec__ (ds, p, f, rY, ry, fy, fm, fd, fh, fmi, fs)
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249
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250 idx = strfind (f, "FFF");
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251 if (! isempty (idx))
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252 ## Kludge to handle FFF millisecond format since strptime does not
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253 f(idx:idx+2) = [];
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254 [~, nc] = strptime (ds, f);
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255 if (nc > 0)
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256 msec = ds(nc:min(nc+2, end));
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257 f = [f(1:idx-1) msec f(idx:end)];
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258 [tm, nc] = strptime (ds, f);
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259 tm.usec = 1000 * str2double (msec);
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260 endif
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261 else
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262 [tm, nc] = strptime (ds, f);
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263 endif
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264
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265 if (nc == columns (ds) + 1)
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266 found = true;
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267 y = tm.year + 1900; m = tm.mon + 1; d = tm.mday;
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268 h = tm.hour; mi = tm.min; s = tm.sec + tm.usec / 1e6;
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269 if (rY < ry)
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270 if (y > 1999)
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271 y -= 2000;
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272 else
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273 y -= 1900;
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274 endif
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275 y += p - mod (p, 100);
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276 if (y < p)
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277 y += 100;
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278 endif
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279 endif
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280 if (! fy && ! fm && ! fd)
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281 tmp = localtime (time ());
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282 ## default is January 1st of current year
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283 y = tmp.year + 1900;
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284 m = 1;
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285 d = 1;
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286 elseif (! fy && fm && fd)
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287 tmp = localtime (time ());
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288 y = tmp.year + 1900;
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289 elseif (fy && fm && ! fd)
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290 d = 1;
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291 endif
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292 if (! fh && ! fmi && ! fs)
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293 h = mi = s = 0;
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294 elseif (fh && fmi && ! fs)
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295 s = 0;
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296 endif
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297 else
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298 y = m = d = h = mi = s = 0;
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299 found = false;
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300 endif
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301
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302 endfunction
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303
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304
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305 %!demo
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306 %! ## Current date and time
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307 %! datevec (now ())
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308
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309 %!shared yr
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310 %! yr = datevec (now)(1); # Some tests could fail around midnight!
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311 ## tests for standard formats: 0, 1, 2, 6, 13, 14, 15, 16, 23
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312 %!assert (datevec ("07-Sep-2000 15:38:09"), [2000,9,7,15,38,9])
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313 %!assert (datevec ("07-Sep-2000"), [2000,9,7,0,0,0])
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314 %!assert (datevec ("09/07/00"), [2000,9,7,0,0,0])
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315 %!assert (datevec ("09/13"), [yr,9,13,0,0,0])
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316 %!assert (datevec ("15:38:09"), [yr,1,1,15,38,9])
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317 %!assert (datevec ("3:38:09 PM"), [yr,1,1,15,38,9])
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318 %!assert (datevec ("15:38"), [yr,1,1,15,38,0])
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319 %!assert (datevec ("03:38 PM"), [yr,1,1,15,38,0])
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320 %!assert (datevec ("03/13/1962"), [1962,3,13,0,0,0])
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321
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322 ## Test millisecond format FFF
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323 %!assert (datevec ("15:38:21.25", "HH:MM:SS.FFF"), [yr,1,1,15,38,21.025])
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324
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325 ## Test structure of return value (bug #42334)
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326 %!test
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327 %! [~, ~, d] = datevec ([1 2; 3 4]);
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328 %! assert (d, [1 2; 3 4]);
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329
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330 ## Other tests
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331 %!assert (datenum (datevec ([-1e4:1e4])), [-1e4:1e4]');
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332 %!test
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333 %! t = linspace (-2e5, 2e5, 10993);
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334 %! assert (all (abs (datenum (datevec (t)) - t') < 1e-5));
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335
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336 %% Test input validation
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337 %!error datevec ()
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338 %!error datevec (1,2,3,4)
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339 %!error <none of the standard formats match> datevec ("foobar")
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340 %!error <DATE not parsed correctly with given format> datevec ("foobar", "%d")
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341