function testvar(varargin)
for k=1:length(varargin)
    x(k)=varargin{k} (1);
    y(k)=varargin{k} (2);
end
xmin=min(0,min(x));
ymin=min(0,min(y));
axis([xmin fix(max(x))+3 ymin fix(max(y))+3])
plot(x,y)