Scilab 5.5.1
Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
mrfit
frequency response fit
Calling Sequence
sys=mrfit(w,mag,order) [num,den]=mrfit(w,mag,order) sys=mrfit(w,mag,order,weight) [num,den]=mrfit(w,mag,order,weight)
Arguments
- w
positive real vector of frequencies (Hz)
- mag
real vector of frequency responses magnitude (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=mrfit(w,mag,order,weight) returns a bi-stable transfer function
G(s)=sys=num/den, of of given order such that
its frequency response magnitude abs(G(w(i)))
matches mag(i) i.e. abs(freq(num,den,%i*w)) should be
close to mag.
weight(i) is the weigth 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)); // syslin('c',Num,Den); fresp=repfreq(G,w); mag=abs(fresp); Gid=mrfit(w,mag,4); frespfit=repfreq(Gid,w); plot2d([w',w'],[mag(:),abs(frespfit(:))])
See Also
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