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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 34f96dd5441b
children a1dbe9d80eee
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1 ## Copyright (C) 1996, 1997 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} {} etime (@var{t1}, @var{t2})
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21 ## Return the difference (in seconds) between two time values returned from
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22 ## @code{clock}. For example:
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23 ##
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24 ## @example
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25 ## t0 = clock ();
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26 ## # many computations later...
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27 ## elapsed_time = etime (clock (), t0);
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28 ## @end example
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29 ##
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30 ## @noindent
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31 ## will set the variable @code{elapsed_time} to the number of seconds since
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32 ## the variable @code{t0} was set.
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33 ## @seealso{tic, toc, clock, cputime}
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34 ## @end deftypefn
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35
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36 ## Author: jwe
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37
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38 function secs = etime (t1, t0)
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39
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40 if (nargin != 2)
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41 print_usage ();
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42 endif
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43
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44 [d1, s1] = datenum (t1);
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45 [d0, s0] = datenum (t0);
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46
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47 secs = s1 - s0;
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48
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49 endfunction
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50
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51 %!assert(etime([1900,12,31,23,59,59],[1901,1,1,0,0,0]),-1)
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52 %!assert(etime([1900,2,28,23,59,59],[1900,3,1,0,0,0]),-1)
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53 %!assert(etime([2000,2,28,23,59,59],[2000,3,1,0,0,0]),-86401)
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54 %!assert(etime([1996,2,28,23,59,59],[1996,3,1,0,0,0]),-86401)
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55 %!test
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56 %! t1 = [1900,12,31,23,59,59; 1900,2,28,23,59,59];
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57 %! t2 = [1901,1,1,0,0,0; 1900,3,1,0,0,0];
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58 %! assert(etime(t2, t1), [1;1]);