转载自：http://blog.sciencenet.cn/blog-762216-1086021.html
% The load function can be used to load txt file, in which each row has the same number of elements.
% This script (read_line) is to read the txt file, in which the last row have a different number of elements.
clear
clc
%re=load('xxx.txt');
re=int16(zeros(1e6,23)); %预定义矩阵,加快速度
fid=fopen('xxx.txt'); %打开文本文件
INDEX=0;
while ~feof(fid)
str = fgetl(fid); % 读取一行, str是字符串
s=regexp(str,'\s+'); % 找出str中的空格, 以空格作为分割数据的字符
temp=str2num(str(s(end):end)); %找出最后的数据, 作为保存与否的判断条件
%temp=str2num(str(s(20):s(21))); %找出某个数据, 作为保存与否的判断条件
if temp>10
INDEX=INDEX+1;
for i=1:length(s) % 将字符串全部转为数组, 存于re中
if i==length(s)
re(INDEX,i)=str2num(str(s(i):end));
else
re(INDEX,i)=str2num(str(s(i):s(i+1)));
end
end
end
end
fclose(fid);
%re2=re(1:INDEX,:);
%dlmwrite(strcat('.\re'),re2,'precision','%2d', 'delimiter', ' '); % save re
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