Scilab Home page | Wiki | Bug tracker | Forge | Mailing list archives | ATOMS | File exchange
Please login or create an account
Change language to: English - Português - 日本語

Please note that the recommended version of Scilab is 6.0.0. This page might be outdated.
See the recommended documentation of this function

Aide Scilab >> Traitement du Signal > mrfit

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

  • cepstrum — cepstrum calculation
  • frfit — frequency response fit
  • freq — frequency response
  • calfrq — frequency response discretization
Scilab Enterprises
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors
Last updated:
Wed Oct 05 12:10:57 CEST 2011