annotate scripts/time/is_leap_year.m @ 20784:32a0bf9906c1

linspace: remove use of error_state. * libinterp/corefcn/data.cc: current use of error_state is only useful for a nicer error message about N not being an integer. However, octave::idx_type_value() does not error for that, and even in that case, it must be cast to integer silently for Matlab compatibility.
author Carnë Draug <carandraug@octave.org>
date Thu, 08 Oct 2015 19:56:51 +0100
parents 2645f9ef8c88
children
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 1996-2015 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 {Function File} {} is_leap_year ()
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21 ## @deftypefnx {Function File} {} is_leap_year (@var{year})
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22 ## Return true if @var{year} is a leap year and false otherwise.
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23 ##
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24 ## If no year is specified, @code{is_leap_year} uses the current year.
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25 ##
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26 ## For example:
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27 ##
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28 ## @example
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29 ## @group
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30 ## is_leap_year (2000)
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31 ## @result{} 1
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32 ## @end group
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33 ## @end example
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34 ## @seealso{weekday, eomday, calendar}
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35 ## @end deftypefn
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36
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37 ## Author: jwe
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38
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39 function retval = is_leap_year (year)
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40
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41 if (nargin > 1)
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42 print_usage ();
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43 endif
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44
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45 if (nargin == 0)
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46 t = clock ();
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47 year = t(1);
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48 endif
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49
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50 retval = (rem (year, 4) == 0 & rem (year, 100) != 0) | (rem (year, 400) == 0);
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51
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52 endfunction
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54
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55 %!assert (is_leap_year (2000), true)
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56 %!assert (is_leap_year (1976), true)
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57 %!assert (is_leap_year (1000), false)
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58 %!assert (is_leap_year (1800), false)
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59 %!assert (is_leap_year (1600), true)
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60
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61 %!error is_leap_year (1, 2)
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62