Re: Internal Precision - Symbolic

[Laurent Hoeltgen]

Hi,

On 21/10/12 17:40, EduardoHenrique wrote:
> Thanks for your answer.
>
> I know it would be easier to go to a symbolic software. But I've my scripts
> all set in Octave. Unfortunately Maxima programming language differs a lot
> of Octave/Matlab/Scilab and isn't "comfortable".

The syntax of maxima is certainly different from the one used in octave. 
I wouldn't call it "uncomfortable". It serves a different purpose and 
for that one it's probably better suited than octave's.

> It seems that Matlab offers this tool (VPA), but it happen to use Maple
> (comercial symbolic tool) to do the symbolic calculations. Isn't there a way
> that Octave could be integrated with Maxima? Or is there a numerical
> software which language is similar to Octave/Matlab and supports this
> variable precision arithmetic?

If I remember right, Matlab uses a software called Mupad for symbolic 
computations. Mupad used to be a standalone software package for 
symbolic computations. Mathworks bought the company that developed it 
years ago and integrated into the symbolic math toolbox. See 
http://de.wikipedia.org/wiki/MuPAD

Maybe you could take a look at Sage (http://www.sagemath.org/) It 
combines several packages for numerical as well as symbolic computations
under a single frontend. As far as I know, you can call octave as well 
as maxima from it. But be warned, the thing is very large in terms of 
necessary disk space.


> If not, I was thinking about one solution to my problem, see if you agree:
> Suppose I want to use VPA in every calculation in Octave. Would it be
> possible to force Octave to execute a script after every calculation it
> does? If so, I could force him to eliminate any digits beyond the ones I
> want. The doubt is: where (in the source
> code) can I add the code to force it to execute a function after any
> evaluation it does?

I'm not familiar enough with octave's source code but I doubt anything 
like this is possible.

> Thanks for your help!
>
>
>
>
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Regards,
Laurent