1 ## Copyright (C) 1996-2012 John W. Eaton
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {} etime (@var{t2}, @var{t1})
21 ## Return the difference in seconds between two time values returned from
22 ## @code{clock} (@math{@var{t2} - @var{t1}}). For example:
27 ## # many computations later@dots{}
28 ## elapsed_time = etime (clock (), t0);
33 ## will set the variable @code{elapsed_time} to the number of seconds since
34 ## the variable @code{t0} was set.
35 ## @seealso{tic, toc, clock, cputime, addtodate}
40 function secs = etime (t2, t1)
46 [~, s2] = datenum (t2);
47 [~, s1] = datenum (t1);
54 %!assert (etime ([1900,12,31,23,59,59],[1901,1,1,0,0,0]),-1)
55 %!assert (etime ([1900,2,28,23,59,59],[1900,3,1,0,0,0]),-1)
56 %!assert (etime ([2000,2,28,23,59,59],[2000,3,1,0,0,0]),-86401)
57 %!assert (etime ([1996,2,28,23,59,59],[1996,3,1,0,0,0]),-86401)
59 %! t1 = [1900,12,31,23,59,59; 1900,2,28,23,59,59];
60 %! t2 = [1901,1,1,0,0,0; 1900,3,1,0,0,0];
61 %! assert(etime(t2, t1), [1;1]);
64 %! t1 = [1993, 8, 20, 4, 56, 1];
65 %! t2 = [1993, 8, 21, 4, 56, 1];
66 %! t3 = [1993, 8, 20, 5, 56, 1];
67 %! t4 = [1993, 8, 20, 4, 57, 1];
68 %! t5 = [1993, 8, 20, 4, 56, 14];
70 %! assert (etime (t2, t1), 86400);
71 %! assert (etime (t3, t1), 3600);
72 %! assert (etime (t4, t1), 60);
73 %! assert (etime (t5, t1), 13);
75 %% Test input validation
78 %!error etime (1, 2, 3);