MATLAB: How to make a variable content part of a path

MATLAB

I have a string variable, which is changing during the loop, it is named filename and it takes on values like 'file001.txt', 'file002.txt'… I am saving the files 'file001.txt', 'file002.txt' in a loop and would like to call the filename variable
>> fid_out = fopen('/Users/Y*****/Downloads/case_data/train2/3/"filename"', 'w'); at the place "filename", I would like it to be 'file001.txt', 'file002.txt'…… how can I realize that?

Best Answer

filepath = '/Users/Y*****/Downloads/case_data/train2/3';
filename = 'file001.txt';
and then use fullfile
fid_out = fopen(fillfile(filepath,filename));
https://www.mathworks.com/help/matlab/ref/fullfile.html
if you store your filenames in a cell array,
 filenames  {'file001.txt', 'file002.txt'};
then it's even better inside a loop
 for fno = 1:numel(filenames)
    fid_out{fno} = fopen(fillfile(filepath,filename{fno}));
    %something
 end
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