Read the documentation for fgetl, which covers exactly this use case. Here is one of the examples from that page:
fid = fopen('fgetl.m');
tline = fgetl(fid);
while ischar(tline)
disp(tline)
tline = fgetl(fid);
end
fclose(fid);
Where the value tline is the string of one row in the text file, which can be passed to your function, or do anything else you want with it. To write a textfile line-by line, you can read about fprintf, which can be used inside a for-loop.
Note that it is a really bad idea to call your function run, as this is already the name of an inbuilt function run . Similarly you should avoid using size, length, path, i, j, etc.
