matlab中读取图中数据 并将其写入文本

h=open('F:\rand.fig');

a=get(h);

b=get(a.Children);

c=get(b.Children);

xx=c.XData;

yy=c.YData;

fid=fopen('F:\rand.txt','w');

[b1]=size(yy,2)

for i=1:b1

fprintf(fid,'%15g',yy(i));

fprintf(fid,'\r\n');

end

fclose(fid);