我尝试画3个y轴，有6组数据，3组使用line画，3组使用scatter画，发现在第2组使用scatter画时，会覆盖之前的图，并且坐标轴发生变动，是为什么？
下面的程序是我在网上找的并更改后的
clc; clear;
x1 = xlsread('case.xlsx', 'case1','b2:b35');
y1 = xlsread('case.xlsx','case1','c2:c35');
x2 = xlsread('case.xlsx', 'case1','b2:b35');
y2 = xlsread('case.xlsx', 'case1','f2:f35');
x3 = xlsread('case.xlsx', 'case1','b2:b35');
y3 = xlsread('case.xlsx', 'case1','i2:i35');
x4 = xlsread('case.xlsx', 'case1','l2:l35');
y4 = xlsread('case.xlsx','case1','m2:m35');
x5 = xlsread('case.xlsx', 'case1','l2:l35');
y5 = xlsread('case.xlsx', 'case1','p2
35');
x6 = xlsread('case.xlsx', 'case1','l2:l35');
y6 = xlsread('case.xlsx', 'case1','s2:s35');
% plot(x1,y1,x2,y2,x3,y3,x4,y4,x5,y5,x6,y6)
ha1 = axes('ycolor','b');
hold on;
h11 = line(x4,y4,'color','b','parent',ha1);
h12 = scatter(x1,y1,'bo','parent',ha1);
hold on;
xlim1 = get(ha1,'xlim'); % 获取第一个axes的x轴的范围，这个值很关键
%
% 建立第二个轴，要与第一个轴重合，并且透明，轴的范围相同
pos1 = get(ha1,'position');
ha2 = axes('position',pos1,'color','none','ycolor','r','yaxislocation','right','xlim',xlim1);
% 画线
h21 = line(x5,y5,'color','r','parent',ha2);
h22 = scatter(x2,y2,'rs','parent',ha2);
hold on;
%
% 建立第三个轴，左侧与前两个轴对齐，右侧要长出一部分，因此该轴的范围要比前轴的范围大，根据范围与轴的长度成正比来计算
pos1(1)=pos1(1);
pos1(3) = pos1(3)*.86;
set([ha1;ha2],'position',pos1);
pos3 = pos1;
pos3(3) = pos3(3)+.12;
xlim3 = xlim1;
xlim3(2) = xlim3(1)+(xlim1(2)-xlim1(1))/pos1(3)*pos3(3);
ha3 = axes('position',pos3, 'color','none','ycolor','g','xlim',xlim3, ...
'xtick',[],'yaxislocation','right','yminortick','on');
% 截去多余数据点，并画线
% [x3, ind] = sort(x3, 2, 'ascend');
% y3 = y3(ind);
% ind2 = (x3<=xlim1(2));
% y3 = y3(ind2);
% x3 = x3(ind2);
h31 = line(x6, y6,'color','g','parent',ha3);
% h32 = scatter(x3,y3,'g^','parent',ha3);
% 隐藏第三个横轴伸出来的部分
ylim3 = get(ha3, 'ylim');
line([xlim1(2),xlim3(2)],[ylim3(1),ylim3(1)],'parent',ha3,'color','none');
% % 加ylabel
% hylab = get([ha1;ha2;ha3],'ylabel');
% hxlab = get(ha1,'xlabel');
% set(hylab{1},'string','bar');
% set(hylab{2},'string','log(x)');
% set(hylab{3},'string','tan(x)');
% % 加xlabel
% set(hxlab,'string', 'x');