y_z_jiao_space2.m

一个小小的c语言编程

function y_z_jiao_space2
global X1 X2 X3 b
L2=X2>(b-1)/2;%焦点
b1=L2.*X2;b2=L2.*X3;
figure(10),h3=title('焦点');
plot(b1,b2,'.')