%% Specify Plotting Interval
% Plot half of the circle x^2 + y^2 =3 by using the intervals -4 < x < 0 and -2 < y < 2. Specify the plotting interval as the second argument of fimplicit.

syms x y
circle = x^2 + y^2 == 3;
fimplicit(circle, [-4 0 -2 2])

% Copyright 2012 The MathWorks, Inc.