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## Re: Setting Precision

 From: Paul Kienzle Subject: Re: Setting Precision Date: Wed, 18 Sep 2002 11:15:37 -0400

```To change the displayed precision you can use the following:

octave:3> output_precision = 3
output_precision = 3
octave:4> pi
pi = 3.14

To change the calculated precision, you can try using the symbolic
toolbox available from octave-forge (http://octave.sf.net).  I say
"try" because it doesn't work like I expect, but I don't know if that
is a bug in my expectations or in the code:

octave:40> symbols
octave:41> digits(3)
ans = 3
octave:42> x = vpa(pi)
x =

3.1416
octave:43> sin(x)
ans =  -8.91e-06
octave:44> sin(pi)
ans =  1.22e-16
octave:45> vpa(2)/vpa(3)
ans =

0.666664

Paul Kienzle

On Wed, Sep 18, 2002 at 12:14:19PM -0300, Diego Ruiz Moreno wrote:
> Hello to all,
>     I ' m using OCTAVE to teaching Numerical Analysis and I want that
> the students make some calculation with different precision .... Is this
> possible ? Is possible to change the number of digit that octave shows
> on the screen (I mean if I ask for PI, Octave answer 3.1416, but I know
> that there are more decimals )?
>
>     Thanks.
>
>     Diego
>
>
>
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
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