Matlab——画图时添加坐标系

x=-10:10; y=-10:10;%此处为坐标系的绘制范围
%此处写函数语句
axis off; hold on;
axis equal
plot([0 0],[min(y) max(y)],\'k\',[min(x) max(x)],[0 0],\'k\');
ax=[max(x),max(x)-0.3,max(x)-0.3;0,0.2,-0.2];
fill(ax(1,:),ax(2,:),\'k\');
ay=[0,0.15,-0.15;max(y),max(y)-0.4,max(y)-0.4];
fill(ay(1,:),ay(2,:),\'k\'); hold on
for i=1:length(x)-1
    if x(i)~=0
        plot([x(i),x(i)],[0,0.1],\'k\'); hold on
        a=text(x(i),-0.4,num2str(x(i)));
        set(a,\'HorizontalAlignment\',\'center\')
    end
    if y(i)~=0
        plot([0,0.1],[y(i),y(i)],\'k\'); hold on
        b=text(-0.4,y(i),num2str(y(i)));
        set(b,\'HorizontalAlignment\',\'center\')
    end
end
c=text(-0.4,-0.4,num2str(0));
set(c,\'HorizontalAlignment\',\'center\')