[scilab-Users] Converting from continuous to discrete time tranfer function.

[steven hallacy]

Thanks.
 
Date: Wed, 1 Aug 2012 14:59:35 +0200
From: vogt at centre-cired.fr
To: users at lists.scilab.org
Subject: Re: [scilab-Users] Converting from continuous to discrete time tranfer function.


  
    
  
  
    On 25/07/2012 00:16, steven hallacy
      wrote:

    
    
      
      
        Hello,

         

        With Scilab, I know of two ways of converting from a continuous
        time transfer function (e.g. 1/s) to a discrete time transfer
        funtion:

         

        1st way:

        s=poly(0,'s')

        ss2tf(cls2dls(tf2ss(syslin('c',1/s)),0.1))
        

         

        This way requires a lot of typing.

         

        2nd Way:

        s=poly(0,'s');z=poly(0,'z');

        sl=syslin('c',1/s);
        

        sl2=horner(sl,(2/0.1)*(z-1)/(z+1))

         

        This way requires me to remember the tustin approximation.

         

        Does matlab have anything like Matlab's c2d function?

        

        Stephen

      
    
    Hi

    

    Did you try defining it yourself?

    

    function y=c2d(x,p)

    

    if argn(2)<2

    p=0.1

    end

    

    

     y=
      ss2tf(cls2dls(tf2ss(syslin('c',x)),p))
    

    endfunction

    

    s=poly(0,'s')

    c2d(1/s)

    

    

    you can do similar stuff each time you use something that requires
    lots of typing

    

    BR

    AVS
 		 	   		  
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