symbolic transfer function
in [Matlab]
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From: Davide Sanseverinati on 4 Aug 2010 05:55 Hi i have this a matrix with symbolic transfer functions like: (s^3 +12346512s^2 + 43242s +1245) / (s^5 +1234s^4+.........+12443) but more complicated. I'd like to express them as gain*Poles/zeros like : K(s+123)(s+432)/((s+ 563)....(s+8765)) I tried to use the command 'factor', but without expected results, i'm looking for in the symbolic toolbox help , but i really have a few time...please, anyone knows how to do it? Thank you
From: Steven_Lord on 4 Aug 2010 09:24 "Davide Sanseverinati" <john.doe.nospam(a)mathworks.com> wrote in message news:i3bdds$lrj$1(a)fred.mathworks.com... > Hi > > i have this a matrix with symbolic transfer functions like: > > (s^3 +12346512s^2 + 43242s +1245) / (s^5 +1234s^4+.........+12443) > but more complicated. > I'd like to express them as gain*Poles/zeros like : > > K(s+123)(s+432)/((s+ 563)....(s+8765)) > > I tried to use the command 'factor', but without expected results, i'm > looking for in the symbolic toolbox help , but i really have a few > time...please, anyone knows how to do it? > Thank you You could try using SIMPLIFY or SIMPLE, or you could break your transfer function into numerator and denominator with NUMDEN and FACTOR each of those pieces separately. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
From: Davide Sanseverinati on 4 Aug 2010 09:44 "Steven_Lord" <slord(a)mathworks.com> wrote in message <i3bpm8$hg3$1(a)fred.mathworks.com>... > > > "Davide Sanseverinati" <john.doe.nospam(a)mathworks.com> wrote in message > news:i3bdds$lrj$1(a)fred.mathworks.com... > > Hi > > > > i have this a matrix with symbolic transfer functions like: > > > > (s^3 +12346512s^2 + 43242s +1245) / (s^5 +1234s^4+.........+12443) > > but more complicated. > > I'd like to express them as gain*Poles/zeros like : > > > > K(s+123)(s+432)/((s+ 563)....(s+8765)) > > > > I tried to use the command 'factor', but without expected results, i'm > > looking for in the symbolic toolbox help , but i really have a few > > time...please, anyone knows how to do it? > > Thank you > > You could try using SIMPLIFY or SIMPLE, or you could break your transfer > function into numerator and denominator with NUMDEN and FACTOR each of those > pieces separately. > > -- > Steve Lord > slord(a)mathworks.com > comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ > To contact Technical Support use the Contact Us link on > http://www.mathworks.com Thank you for the fast reply! one last thing. After doing that, i have the transfer function in this form: / 483 6207 \ |s + --- + ----- i | \ 500 10000 / with the numbers expressed as a ratio: instead i need to express them as a decimal number rounded to the first 4 decimal digits. I tried to use ROUND function, but it doesn't work. How can i change the form?
From: Steven_Lord on 4 Aug 2010 10:15 "Davide Sanseverinati" <john.doe.nospam(a)mathworks.com> wrote in message news:i3bqr5$20q$1(a)fred.mathworks.com... > "Steven_Lord" <slord(a)mathworks.com> wrote in message > <i3bpm8$hg3$1(a)fred.mathworks.com>... *snip* > Thank you for the fast reply! > one last thing. After doing that, i have the transfer function in this > form: > / 483 6207 \ |s + --- + ----- i | \ 500 10000 > / > with the numbers expressed as a ratio: instead i need to express them as a > decimal number rounded to the first 4 decimal digits. I tried to use ROUND > function, but it doesn't work. How can i change the form? Use VPA. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
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