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Re: inconsistent behavior of 'clock'

From: John W. Eaton
Subject: Re: inconsistent behavior of 'clock'
Date: Tue, 23 Mar 1999 17:46:17 -0600 (CST)

On 21-Mar-1999, Mike Miller <address@hidden> wrote:

| Well, after spending a bunch of time on it, I found the old bug reports
| and I see that it's fixed in newer versions of Octave.  I'm still using
| the stable version.  Anyway, as everyone seems to know, the bug was in
| localtime--it rounds off sec instead of using floor.
| This leads to another issue.  Why recommend the combined use of etime and
| clock when we can just use 'time' as follows:
| t0=time; big_job; time-t0
| instead of the more awkward and inefficient:
| t0=clock; big_job; etime(clock,t0)
| What do you think?

I agree.  Does the manual recommend clock and etime over a simple
difference in the values returned from time?  If so, can you please
say exactly where?

| Don't they do the same thing in theory?  In practice,
| both localtime and clock stand in the middle and can cause errors when
| etime is used.  So 'time' alone is easier and more efficient.


Also, if you want cpu time instead of wall clock time, you should use
the cputime function instead.


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