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    0.1200    0.1300

  15 至 28 列

    0.1400    0.1500    0.1600    0.1700    0.1800    0.1900    0.2000    0.2100    0.2200    0.2300    0.2400    0.2500    0.2600    0.2700

  29 至 42 列

    0.2800    0.2900    0.3000    0.3100    0.3200    0.3300    0.3400    0.3500    0.3600    0.3700    0.3800    0.3900    0.4000    0.4100

  43 至 44 列

    0.4200    0.4300

y =

  1 至 14 列

         0    0.0001    0.0004    0.0009    0.0016    0.0025    0.0036    0.0049    0.0064    0.0081    0.0100    0.0121    0.0144    0.0169

  15 至 28 列

    0.0196    0.0225    0.0256    0.0289    0.0324    0.0361    0.0400    0.0441    0.0484    0.0529    0.0576    0.0625    0.0676    0.0729

  29 至 42 列

    0.0784    0.0841    0.0900    0.0961    0.1024    0.1089    0.1156    0.1225    0.1296    0.1369    0.1444    0.1521    0.1600    0.1681

  43 至 44 列

    0.1764    0.1849