www.gusucode.com > symbolic 源码程序 matlab案例代码 > symbolic/SpecifyPlottingIntervalAndPlotMultipleImplicitEquationsExample.m

    %% Specify Plotting Interval
% Plot half of the circle $x^{\strut 2} + y^2 =3$ 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])