将.txt数据读取到Matlab [英] Reading .txt data to Matlab

问题描述

我正在尝试从此.txt中读取数据:

I am trying to read data from this .txt:

obiekt.DEF


Timeplot
Column01: P abs h01 L1 [W]
Column02: P abs h01 L2 [W]
Column03: P abs h01 L3 [W]
Column04: P abs h01 Sum [W]

Time                         Column01    Column02    Column03    Column04
11.03.2004 09:17:02              23500       19812       21529    64,84e+3
11.03.2004 09:17:05              23316       19789       21519    64,62e+3
11.03.2004 09:17:08              23207       19759       21392    64,36e+3

我只需要来自列01、02、03的数据.有些数据带有，"而不是.".怎么改变呢?我有很多这样的文件.我尝试了此功能，但是它将所有数据写入一个变量.

I only need data from column: 01,02,03. Some data have ',' instead '.'. How to change it? I have many file like this. I tried this function, but it write all data to one variable.

b=textread('test.txt','%s','delimiter',' ','whitespace',' ');

推荐答案

您可以使用textscan:

You could use textscan:

filename='myfile.txt';
fid=fopen(filename,'r');
data=textscan(fid,'%*s%*s%s%s%s%*s','HeaderLines',10,'CollectOutput',1);
fclose(fid);
data=strrep(data{1},',','.');
data=cellfun(@str2num, data);

设置HeaderLines设置要忽略的前10行.设置CollectOutput将相同类型的项目分组到一个单元格数组中(因此我们得到3列字符串). formatspec '%*s%*s%s%s%s%*s'忽略日期，时间和Column04，并将Column01-03转换为字符串.然后strrep用句点替换逗号. cellfun在每个单元格上调用str2num并将字符串转换为数字.

Setting HeaderLines sets the first 10 lines to be ignored. Setting CollectOutput groups items of the same type into a cell array (so we get 3 columns of strings). The formatspec '%*s%*s%s%s%s%*s' ignores the date, time and Column04 and converts Column01-03 to strings. Then strrep replaces the commas with periods. cellfun calls str2num on each cell and converts the string to a number.

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