Read Text File in Matlab

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Khan Muhammad Adeel Khan 2020-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/532643-read-text-file-in-matlab

评论： Khan Muhammad Adeel Khan 2020-5-26

采纳的回答： Rik

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How ca I read such text file in matlab:

Covariances:

Estimate Std.Err z-value P(>|z|) Std.lv Std.all

read ~~

read1 0.696 0.040 17.535 0.000 0.696 0.696

I want matlab to read (read1) line and it's line69 in my text file. I tried to read it via following command but unable to read it

match1 = regexp(file,'(?<\s\s\s\sfi\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s)(\d*.?\d*)(\s\s\s\s)(\d*.?\d*)(\s\s\s\s)(\d*.?\d*)(\s\s\s\s)(\d*.?\d*)(\s\s\s\s)(\d*.?\d*)','match');

Kindly guide me

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Rik 2020-5-25

Is there a specific reason you are trying to use such a complex regular expression?

It would be best if you attach an example text file.

A last note: tagging a person doesn't notify them, so there is no need to do so. I have removed them, since they do not describe your question.

Khan Muhammad Adeel Khan 2020-5-25

ch1.txt

@Rik I want to matlab to read the line 69 in the attached text file. Thanks for the swift response as I am newbie here so don't know the complete procedure to use this platform effectively.

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Rik 2020-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/532643-read-text-file-in-matlab#answer_438093

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There are many ways to do this. One of the many ways is using the code below. It makes use of the readfile function which you can find here on the FEX. It reads a file to a cell array.

%read the file to a cell array (1 line per cell)
data=readfile('ch1.txt');
%find relevant line
line=find(ismember(data,{'Covariances:'}));
line=line+3;%go to the line with the data
str=data{line};
%trim leading spaces
str=strtrim(str);
%remove header
spacepos=strfind(str,' ');str(1:spacepos(1))='';
%convert to values
val=textscan(str,'%f');val=val{1};

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Khan Muhammad Adeel Khan 2020-5-26

编辑：Rik 2020-5-26

在 MATLAB Online 中打开

I want matlab to read multiple text file and same all the results (from a specific line) in all_results=[];. I have attached the text files in the offset folder as a reference. But when I execute it, it generates an error. Kindly check the code once.

EDIdir = 'E:\Result\fooof\CE\slope\offset\';
S = dir(fullfile(EDIdir,'*.txt'));
all_results=[];
% out = cell(size(S));
for k = 1:numel(S)
    fname = S(k).name;
    %read the file to a cell array (1 line per cell)
    data=readfile(S);
    %find relevant line
    line=find(ismember(data,{'Covariances:'}));
    line=line+3;%go to the line with the data
    str=data{line};
    %trim leading spaces
    str=strtrim(str);
    %remove header
    spacepos=strfind(str,' ');str(1:spacepos(1))='';
    %convert to values
    val=textscan(str,'%f');val=val{1}';
    all_results1=val;
    all_results=[all_results;all_results1];
end

Rik 2020-5-26

You're welcome. You aren't bothering me, if you were I would probably just ignore this thread. (although to be clear: not responding could also mean I have little time or I missed a post)

I can recommend the Onramp course provided by Mathworks. It should teach you the basics.

The reason for the error in this case is the path. If you don't specify a complete path to your file, Matlab will look in your current folder and then in the installation folders of Matlab itself. That is true for function calls, but also files you are trying to read.

Khan Muhammad Adeel Khan 2020-5-26