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format long
num=3;
fid=fopen('df.txt','a');
for i=1:num
    a=zeros(1,i);
    fprintf(fid,'%12.10f',a);
    fprintf(fid,'\n');
end
fclose(fid);
È»ºó¶Áȡ֮ºó£¬load df.txt
¾¹ÊÇÕâÑùdf=[0;0;0];
ÆäʵÊý¾Ý´æ´¢µÄÐÎʽÊÇ
0    0 0     0 0 0
ÎÒÏë¶ÁÈ¡µÄÐÎʽÊÇ£ºdf=[0 0 0£»0 0 0£»0 0 0]£¬¼´ÁÐÊý²»Í¬Ê±£¬ÔÚºóÃæ²¹0£¬¹¹³ÉÒ»¸ö¾ØÕó¡£
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