Scilab 5.5.2
Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
frfit
frequency response fit
Calling Sequence
sys=frfit(w,fresp,order) [num,den]=frfit(w,fresp,order) sys=frfit(w,fresp,order,weight) [num,den]=frfit(w,fresp,order,weight)
Arguments
- w
positive real vector of frequencies (Hz)
- fresp
complex vector of frequency responses (same size as
w)- order
integer (required order, degree of
den)- weight
positive real vector (default value
ones(w)).- num,den
stable polynomials
Description
sys=frfit(w,fresp,order,weight) returns a bi-stable transfer function
G(s)=sys=num/den, of of given order such that
its frequency response G(w(i)) matches fresp(i), i.e.
freq(num,den,%i*w) should be close to fresp.
weight(i) is the weight given to w(i).
Examples
w=0.01:0.01:2; s=poly(0,'s'); G=syslin('c',2*(s.^2+0.1*s+2), (s.^2+s+1)*(s.^2+0.3*s+1)); fresp=repfreq(G,w); Gid=frfit(w,fresp,4); frespfit=repfreq(Gid,w); bode(w,[fresp;frespfit])
See Also
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