[Octave-bug-tracker] [bug #38297] bilinear function in Octave is not compatible with Matlab

[sarbjit]

URL:
  <http://savannah.gnu.org/bugs/?38297>

                 Summary: bilinear function in Octave is not compatible with
Matlab 
                 Project: GNU Octave
            Submitted by: sarbjit
            Submitted on: Sun 10 Feb 2013 04:36:41 AM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: sarbjit
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.2
        Operating System: Microsoft Windows

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Details:

Hi,

bilinear function which is used for conversion of analog to digital filters is
not compatible with Matlab. Matlab version of this function provides support
to take "pre-warping" frequency as an argument. 

Matlab Syntax:-
[zd,pd,kd]=bilinear(z,p,k,fs)
[zd,pd,kd]=bilinear(z,p,k,fs,fp)
[numd,dend]=bilinear(num,den,fs)
[numd,dend]=bilinear(num,den,fs,fp)
[Ad,Bd,Cd,Dd]=bilinear(A,B,C,D,fs)
[Ad,Bd,Cd,Dd]=bilinear(A,B,C,D,fs,fp)

While the bilinear available in Octave has the following syntax:

 usage: [Zz, Zp, Zg] = bilinear(Sz, Sp, Sg, T)
        [Zb, Za] = bilinear(Sb, Sa, T) 

For more details refer :
http://www.mathworks.in/help/signal/ref/bilinear.html

-Sarbjit





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