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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/cheb2mag.cat
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cheb2mag          Scilab Group          Scilab Function            cheb2mag
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NAME
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   cheb2mag - response of type 2 Chebyshev filter
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CALLING SEQUENCE
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 [h2]=cheb2mag(n,omegar,A,sample)
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PARAMETERS
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 n          : integer ; filter order 
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 omegar     : real scalar : cut-off frequency
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 A          : attenuation in stop band
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 sample     : vector of frequencies where cheb2mag is evaluated
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 h2         : vector of Chebyshev II filter values at sample points
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DESCRIPTION
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   Square magnitude response of a type 2 Chebyshev filter.
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   omegar = stopband edge, sample = vector of  frequencies where the square
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  magnitude h2 is desired.
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EXAMPLE
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 //Chebyshev; ripple in the stopband
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 n=10;omegar=6;A=1/0.2;sample=0.0001:0.05:10;
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 h2=cheb2mag(n,omegar,A,sample);
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 plot(sample,log(h2)/log(10),'frequencies','magnitude in dB')
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 //Plotting of frequency edges
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 minval=(-maxi(-log(h2)))/log(10);
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 plot2d([omegar;omegar],[minval;0],[2],"000");
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 //Computation of the attenuation in dB at the stopband edge
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 attenuation=-log(A*A)/log(10);
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 plot2d(sample',attenuation*ones(sample)',[5],"000")
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SEE ALSO
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   cheb1mag 
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