annotate scripts/time/is_leap_year.m @ 20162:2645f9ef8c88 stable

doc: Update more docstrings to have one sentence summary as first line. Reviewed specfun, special-matrix, testfun, and time script directories. * scripts/specfun/expint.m, scripts/specfun/isprime.m, scripts/specfun/legendre.m, scripts/specfun/primes.m, scripts/specfun/reallog.m, scripts/specfun/realsqrt.m, scripts/special-matrix/gallery.m, scripts/special-matrix/hadamard.m, scripts/special-matrix/hankel.m, scripts/special-matrix/hilb.m, scripts/special-matrix/invhilb.m, scripts/special-matrix/magic.m, scripts/special-matrix/pascal.m, scripts/special-matrix/rosser.m, scripts/special-matrix/toeplitz.m, scripts/special-matrix/vander.m, scripts/special-matrix/wilkinson.m, scripts/testfun/assert.m, scripts/testfun/demo.m, scripts/testfun/example.m, scripts/testfun/fail.m, scripts/testfun/rundemos.m, scripts/testfun/runtests.m, scripts/testfun/speed.m, scripts/time/asctime.m, scripts/time/calendar.m, scripts/time/clock.m, scripts/time/ctime.m, scripts/time/datenum.m, scripts/time/datestr.m, scripts/time/datevec.m, scripts/time/etime.m, scripts/time/is_leap_year.m, scripts/time/now.m, scripts/time/weekday.m: Update more docstrings to have one sentence summary as first line.
author Rik <rik@octave.org>
date Sun, 03 May 2015 17:00:11 -0700
parents 4197fc428c7d
children
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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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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