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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
function []=m_circle(gain)
//this function is obsolete, superseeded by hallchart.
[lhr,rhs]=argn(0)
//
d36=11;
if rhs<1 then
gain=[-12 -8 -6 -5 -4 -3 -2 -1.4 -1 -.5 0.25 0.5 0.7 1 1.4 ..
2 2.3 3 4 5 6 8 12]
else
gain=matrix(gain,1,prod(size(gain)))
end
//
titre="isogain contours for y/(1+y)"
l10=log(10);
//
lambda=exp(l10*gain/20)
rayon=lambda./(lambda.*lambda-ones(lambda))
centre=-lambda.*rayon
rayon=abs(rayon)
rect=[min(centre-rayon),min(-rayon),max(centre+rayon),max(rayon)];
//
fig=gcf();
immediate_drawing=fig.immediate_drawing;
fig.immediate_drawing="off";
ax=gca();
llrect=xstringl(0,0,"1")
hx=llrect(3);
//
for i=1:prod(size(gain))
sgn=1;if 2*int(i/2)==i then sgn=-1,end
g=string(gain(i)),ng=length(g)
if gain(i)<0 then
w=0:0.03:%pi;
xx=centre(i)+rayon(i)*sin(%pi/3)+hx
xy=sgn*cos(%pi/3)*rayon(i)
else
xx=centre(i)-sin(%pi/3)*rayon(i)-hx*ng
xy=sgn*cos(-%pi/3)*rayon(i)
w=-%pi:0.03:0;
end;
n=prod(size(w))
rf=centre(i)*ones(w)+rayon(i)*exp(%i*w);
xpoly([real(rf) real(rf($:-1:1))],[imag(rf) -imag(rf($:-1:1))])
e=gce();e.foreground=3;e.clip_state="clipgrf"
end;
fig.immediate_drawing=immediate_drawing;
endfunction
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