[Scilab-users] Symbolic computation in Scilab

[Pablo Fonovich]

Hi:
As far as i know, scilab does not have a symbolic function for an infinite summation...
Scilab is mainly intended for numeric calculation... so that functions are not yet implemented (perhaps in future versions).

If you want to do a symbolic calculation of the z-transfor you mentioned, and you want free software, i would use maxima... It's a powerfull symbolic software...

In maxima you could simply do

"sum(0.5^n*z^(-n), n, 1, inf), simpsum;"

then, you will have to input some conditions that you can see from the ROC of the z-transform... In this case maxima will ask:

"Is "2*abs(z)-1" positive, negative or zero?"

And i assume it's possitive given the function you want to transform... then you type 

"p"

and you will get the answer...

If someone knows a toolbox for scilab to do this... please tell us!

I hope this is usefull for you

> Date: Wed, 12 Aug 2015 10:43:23 -0700
> From: doole93 at gmail.com
> To: users at lists.scilab.org
> Subject: [Scilab-users] Symbolic computation in Scilab
> 
> Greetings everyone.
> I'm completely new to Scilab so forgive my if this question is to simple. 
> I need some sort of way to allow symbolic computation in Scilab. I need to
> execute commands like *symsum*, and for that, based on my current research,
> i need to install some kind of additional toolbox. I have Windows 8.1, and i
> have seen certain toolboxes which require explicitly Linux. I have a very
> limited amount of time to do a project in Scilab for z-transformation of
> discrete time signals (next 4-5 days) and so I really need to be able to
> execute little scripts like this one. 
> 
> syms n z;
> a = 0.5;
> x =(a)^n
> X = symsum (x*(z^(-n)),n ,0, %inf )
> disp (X," ans=")
> 
> Any help, in form of some instructions, download link for additional
> software or anything else would be much appreciated.
> Thanks in advance
> 
> 
> 
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