clear
clc
close all
cd('C:\Users\wind\Desktop')
ha=axes('units','normalized','position',[0 0 1 1]);
uistack(ha,'down')
II=imread('PP.png');
image(II)
colormap gray
set(ha,'handlevisibility','off','visible','off');
x=-pi:0.1:pi;
y=x.*sin(x.*cos(x)).*tan(x);
plot(x,y,'LineWidth',2)
set(gca,'color','none') %这里以前自己没有注意
