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// 08.09.09
// 08.09.20
// 13.10.19 ( __ added to variables )
function Out__=Implicitplot(varargin)
Eps__=10^(-4);
Nargs__=length(varargin);
Fstr__=varargin(1);
if Mixtype(Fstr__)~=1
MS__=Fstr__;
[Zval__,Xval__,Yval__]=Makevaltable(MS__);
elseif type(Fstr__)==10
MS__=[];
for I__=1:Nargs__
MS__=Mixadd(MS__,varargin(I__));
end;
[Zval__,Xval__,Yval__]=Makevaltable(MS__);
else
Zval__=varargin(1);
Xval__=varargin(2);
Yval__=varargin(3);
end;
Out__=[];
for J__=1:length(Yval__)-1
for I__=1:length(Xval__)-1
a1__=Xval__(I__);b1__=Yval__(J__);c1__=Zval__(J__,I__);
a2__=Xval__(I__+1);b2__=Yval__(J__);c2__=Zval__(J__,I__+1);
a3__=Xval__(I__+1);b3__=Yval__(J__+1);c3__=Zval__(J__+1,I__+1);
a4__=Xval__(I__);b4__=Yval__(J__+1);c4__=Zval__(J__+1,I__);
PL__=[a1__,b1__;a2__,b2__;a3__,b3__;a4__,b4__;a1__,b1__];
VL__=[c1__,c2__,c3__,c4__,c1__];
QL__=[];
for K__=1:4
if abs(VL__(K__))<=Eps__
QL__=[QL__;PL__(K__,:)];
elseif VL__(K__)>Eps__
if VL__(K__+1)<-Eps__
Tmp__=1/(VL__(K__)-VL__(K__+1))*(-VL__(K__+1)*PL__(K__,:)...
+ VL__(K__)*PL__(K__+1,:));
QL__=[QL__;Tmp__];
end
else
if VL__(K__+1)>Eps__
Tmp__=1/(-VL__(K__)+VL__(K__+1))*(VL__(K__+1)*PL__(K__,:)...
- VL__(K__)*PL__(K__+1,:));
QL__=[QL__;Tmp__];
end;
end;
end;
if size(QL__,1)==2
Out__=[Out__;%inf,%inf;QL__(1,:);QL__(2,:)];
end;
end;
end;
Out__=Out__(2:size(Out__,1),:);
if size(Out__,1)>0
Out__=Connectseg(Out__);
else
Out__=[];
end;
endfunction;
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