从matlab生成的fig图片中读取数据

 首先编程，画一个fig图片，手动保存为untitled.fig，如图所示；

close all
a=0:0.1:4.3;
b=a.^2;
plot(a,b,'k-','LineWidth',2);
grid on
set(0,'defaultfigurecolor','w')
saveas(fig,untitled)

然后编程，读取图片中的x轴和y轴数据，

close all;clear all
open('untitled.fig')
h=findall(gcf,'type','line')
x=get(h,'xdata')
y=get(h,'ydata')
%z=get(h,'zdata')

读取结果如下： 

x =

  1 至 14 列

         0    0.0100    0.0200    0.0300    0.0400    0.0500    0.0600    0.0700    0.0800    0.0900    0.1000    0.1100