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tic.m
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1999-12-15
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## Copyright (C) 1996, 1997 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## -*- texinfo -*-
## @deftypefn {Function File} {} tic ()
## @deftypefnx {Function File} {} toc ()
## These functions set and check a wall-clock timer. For example,
##
## @example
## tic ();
## # many computations later...
## elapsed_time = toc ();
## @end example
##
## @noindent
## will set the variable @code{elapsed_time} to the number of seconds since
## the most recent call to the function @code{tic}.
##
## If you are more interested in the CPU time that your process used, you
## should use the @code{cputime} function instead. The @code{tic} and
## @code{toc} functions report the actual wall clock time that elapsed
## between the calls. This may include time spent processing other jobs or
## doing nothing at all. For example,
##
## @example
## @group
## tic (); sleep (5); toc ()
## @result{} 5
## t = cputime (); sleep (5); cputime () - t
## @result{} 0
## @end group
## @end example
##
## @noindent
## (This example also illustrates that the CPU timer may have a fairly
## coarse resolution.)
## @end deftypefn
## Author: jwe
function tic ()
if (nargin != 0)
warning ("tic: ignoring extra arguments");
endif
global __tic_toc_timestamp__;
__tic_toc_timestamp__ = clock ();
endfunction