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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2005-01-09 22:58:21 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20050109225821-473xr8vhgugxxx5j
Tags: 3.0-12
http://bugs.debian.org/255869
changed configure.in to build scilab's own malloc.o, closes: #255869

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man/signal/frfit.man
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.TH frfit 1 "April 1993" "Scilab Group" "Scilab Function"
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.so ../sci.an
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.SH NAME
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frfit - frequency response fit
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.SH CALLING SEQUENCE
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.nf
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sys=frfit(w,fresp,order)
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[num,den]=frfit(w,fresp,order)
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sys=frfit(w,fresp,order,weight)
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[num,den]=frfit(w,fresp,order,weight)
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.fi
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.SH PARAMETERS
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.TP 10
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w
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: positive real vector of frequencies (Hz)
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.TP
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fresp
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: complex vector of frequency responses (same size as \fVw\fR)
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.TP
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order
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: integer (required order, degree of \fVden\fR)
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.TP
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weight
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: positive real vector (default value \fVones(w)\fR).
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.TP
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num,den
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: stable polynomials
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.SH DESCRIPTION
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\fVsys=frfit(w,fresp,order,weight)\fR returns a bi-stable transfer function
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\fVG(s)=sys=num/den\fR, of of given \fVorder\fR such that 
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its frequency response \fVG(w(i))\fR matches \fVfresp(i)\fR, i.e.
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\fVfreq(num,den,%i*w)\fR should be close to \fVfresp\fR.
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\fVweight(i)\fR is the weight given to \fVw(i)\fR.
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.SH EXAMPLE
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.nf
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w=0.01:0.01:2;s=poly(0,'s');
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G=syslin('c',2*(s^2+0.1*s+2), (s^2+s+1)*(s^2+0.3*s+1));
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fresp=repfreq(G,w);
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Gid=frfit(w,fresp,4);
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frespfit=repfreq(Gid,w);
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bode(w,[fresp;frespfit])
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.fi
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.SH SEE ALSO
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frep2tf, factors, cepstrum, mrfit, freq, calfrq
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