fopen files in one dataset

Hi!

I collected two different data sets from 30 subjects, so in total I have 60 different .txt files. My goal is to have them all in one big dataset, already in order. The files have different endings (_MT or _OT), depending on the coniditon. Each subject should therefore appear twice within the dataset, but already labeled with 0 or 1 for the condition. I tried to go with a for loop.

for ssubj = 001:030

filename = ['VP0', num2str(ssubj), '_MT.txt'];

filename2 = ['VP0', num2str(ssubj), '_OT.txt'];

file = fopen('/Users/cf/Documents/MATLAB/Passive');

tmp = textscan(file, '%s%f%f%f', 'CollectOutput', true, 'Delimiter', ' ', 'HeaderLines', 3);

[~] = fclose(file);

dat(: , 1, ssubj) =

end

I always get this error... Or is the directory already wrong?

Error using textscan

Invalid file identifier. Use fopen to generate a valid file identifier.

Thank you for your help!

[Mathieu NOE]

hi

could you share some data files (both extensions)

[Mathieu NOE]

I will not repeat Rik's comment below

this is probably what you intended to do :

bside that , you can add your specific folder by using fullfile :

for ssubj = 001:030 
    filename = ['VP0', num2str(ssubj), '_MT.txt'];
    filename2 = ['VP0', num2str(ssubj), '_OT.txt'];
    % get data from first file 
    fid = fopen(filename);
    out1  = textscan(fid, '%s%f%f%f', 'CollectOutput', true, 'Delimiter', ' ', 'HeaderLines', 3);
    [~] = fclose(fid);
    % get data from second file 
    fid = fopen(filename2);
    out2  = textscan(fid, '%s%f%f%f', 'CollectOutput', true, 'Delimiter', ' ', 'HeaderLines', 3);
    [~] = fclose(fid);    
    % process the data 
%     dat(: , 1, ssubj) = ;
end

[TS]

Thank you very much for writing the code!!

I just tried to use it and changed my file name into the first files, however I do still get the same error :(

[Rik]

Are you sure the files exist? You don't check if they exist.

You can check if Matlab is able to open the file by checking if the fid is above 0.

[Mathieu NOE]

you can , at least, test my code in the same directory of your data files

it should work , because this is very basically what I did

then, if you need to access your data from different folder(s) use fullfile with the folder / directory info

Answer 1

[Rik]

You don't use either filename when calling fopen. How is Matlab supposed to know which file you mean?

I would suggest using either readlines (introduced in R2020b) or readfile (which you from the FEX, if you are using R2017a or later, you can also get it through the AddOn-manager). Both of those functions will be able to deal with the UTF-8 encoding in your files. The first will return your file as a string vector, the latter as a cellstr.

[TS]

Hey, sorry I dont quite get that. So instead of fopen(filename) I use the code of readlines?

[Rik]

%instead of this
filename = ['VP0', num2str(ssubj), '_MT.txt'];
fid = fopen(filename);
out1 = textscan(fid, '%s%f%f%f', 'CollectOutput', true, 'Delimiter', ' ', 'HeaderLines', 3);
fclose(fid);

%use this
filename = ['VP0', num2str(ssubj), '_MT.txt'];
out1=readfile(filename); %(requires downloading the FEX submission or adding it through the Add-On Manager)

%or this
filename = ['VP0', num2str(ssubj), '_MT.txt'];
out1=cellstr(readlines(filename));%(requires R2020b)