variable for filename in fopen

[Blitz]

I need to read a bunch of txt files in a directory.  For some reason, fopen
does not like passing a variable instead of an explicitly declared string
(i.e. "File1.txt").  The snippet below creates an array with file names,
then is supposed to open those files, one by one.  If I replace 'reading'
with some string, it works.  As far as I can tell, the variable 'reading' is
a string, so this should work.  Ideas?  



list = ls *.txt;
for i = 1:length(list),
    reading = list(i, :)
    fid = fopen(reading, 'r') % open the file
    % do stuff
end;
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