From help-octave-request at bevo dot che dot wisc dot edu Fri Nov 28 03:08:46 2003
Subject: Re: strange problem
From: Tomer Altman <taltman at lbl dot gov>
To: Christoph Dalitz <christoph dot dalitz at hs-niederrhein dot de>
cc: Mike Miller <mbmiller at taxa dot epi dot umn dot edu>,    Octave Mailing List <help-octave@bevo.che.wisc.edu>
Date: Fri, 28 Nov 2003 01:08:35 -0800 (PST)

I believe you can only overload user-defined ( read as: M-file
functions ) functions. I'm not sure about OCT-file functions. And I
can confidently say that you are not able to overload built-in
functions.

~Tomer


On Nov 28, 2003 at 10:00am, Christoph Dalitz wrote:

christ >Date: Fri, 28 Nov 2003 10:00:36 +0100
christ >From: Christoph Dalitz <christoph dot dalitz at hs-niederrhein dot de>
christ >To: Mike Miller <mbmiller at taxa dot epi dot umn dot edu>
christ >Cc: Octave Mailing List <help-octave at bevo dot che dot wisc dot edu>
christ >Subject: Re: strange problem
christ >Resent-Date: Fri, 28 Nov 2003 03:03:09 -0600
christ >Resent-From: help-octave at bevo dot che dot wisc dot edu
christ >
christ >On Fri, 28 Nov 2003 02:34:07 -0600 (CST)
christ >Mike Miller <mbmiller at taxa dot epi dot umn dot edu> wrote:
christ >>
christ >> > > The number -2.0817e-17 is -0.000000000000000020817, which is very, very
christ >> > > close to zero.
christ >> >
christ >> > Is there an Octave function that truncates/rounds such small numbers to
christ >> > zero (like the Scilab function "clean")?
christ >> >
christ >> > I have tried "help round" and "help trunc", but found nothing
christ >> > appropriate.
christ >> 
christ >> Why not use 'round' but first multiply by a large number, then divide by
christ >> that same number after round.
christ >> 
christ >For some strange reason I believed that there was no "round" function because
christ >it is not documented ("help round" gives "help: sorry, `round' is not documented").
christ >
christ >> You could write a function that performs that operation on matrices.
christ >> 
christ >Tried this with:
christ >
christ >	function y = round(x,n)
christ >	  y = round(x*10^n)/10^n;
christ >	endfunction
christ >
christ >It seems however that Octave does not support function overloading, because
christ >I obtain the error
christ >
christ >	octave:3> round(5.4,0)
christ >	error: round: too many arguments
christ >
christ >I am using Octave 2.1.35. Is function overloading supported in some later version?
christ >
christ >Thanks,
christ >
christ >Christoph
christ >
christ >
christ >
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christ >Octave is freely available under the terms of the GNU GPL.
christ >
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christ >
christ >



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