exm0721_4.m

这是本人收集的一些程序源代码

%exm0721_4.m
th = [0:pi/50:2*pi]';
a = [0.5:.5:4.5];
X = cos(th)*a;
Y = sin(th)*sqrt(25-a.^2);
shg
plot(X,Y)
axis('equal'),xlabel('x'), ylabel('y')
title('A set of Ellipses')