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annotate scripts/time/etime.m @ 11523:fd0a3ac60b0e

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update copyright notices
author John W. Eaton <jwe@octave.org>
date Fri, 14 Jan 2011 05:47:45 -0500
parents c776f063fefe
children c792872f8942
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11523
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1996-2011 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{t2}, @var{t1})
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21 ## Return the difference in seconds between two time values returned from
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22 ## @code{clock} (@math{@var{t2} - @var{t1}}). For example:
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23 ##
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24 ## @example
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25 ## @group
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26 ## t0 = clock ();
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27 ## # many computations later@dots{}
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28 ## elapsed_time = etime (clock (), t0);
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29 ## @end group
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30 ## @end example
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31 ##
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32 ## @noindent
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33 ## will set the variable @code{elapsed_time} to the number of seconds since
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34 ## the variable @code{t0} was set.
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35 ## @seealso{tic, toc, clock, cputime}
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36 ## @end deftypefn
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37
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38 ## Author: jwe
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39
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40 function secs = etime (t2, t1)
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41
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42 if (nargin != 2)
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43 print_usage ();
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44 endif
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45
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46 [~, s2] = datenum (t2);
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47 [~, s1] = datenum (t1);
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48
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49 secs = s2 - s1;
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50
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51 endfunction
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53 %!assert(etime([1900,12,31,23,59,59],[1901,1,1,0,0,0]),-1)
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54 %!assert(etime([1900,2,28,23,59,59],[1900,3,1,0,0,0]),-1)
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55 %!assert(etime([2000,2,28,23,59,59],[2000,3,1,0,0,0]),-86401)
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56 %!assert(etime([1996,2,28,23,59,59],[1996,3,1,0,0,0]),-86401)
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57 %!test
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58 %! t1 = [1900,12,31,23,59,59; 1900,2,28,23,59,59];
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59 %! t2 = [1901,1,1,0,0,0; 1900,3,1,0,0,0];
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60 %! assert(etime(t2, t1), [1;1]);
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61
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62 %!test
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63 %! t1 = [1993, 8, 20, 4, 56, 1];
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64 %! t2 = [1993, 8, 21, 4, 56, 1];
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65 %! t3 = [1993, 8, 20, 5, 56, 1];
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66 %! t4 = [1993, 8, 20, 4, 57, 1];
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67 %! t5 = [1993, 8, 20, 4, 56, 14];
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68 %!
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69 %! assert((etime (t2, t1) == 86400 && etime (t3, t1) == 3600
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70 %! && etime (t4, t1) == 60 && etime (t5, t1) == 13));
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72 %!error etime ();
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73
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74 %!error etime (1, 2, 3);
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75