Invalid permission error with fopen()

for i = 1:30
    fid = fopen('%d.asc', i, 'r');
    C = textscan(fid, '%s%s', 'Delimiter',',', 'HeaderLines', 1);
    for k = 1:1046
        E(k,1) = E(k,1) + str2double(string(C{1,1}(k,1)));
        E(k,2) = E(k,2) + str2double(string(C{1,2}(k,1)));  
    end
    fclose(fid);
end
E = (1/30) * E;
E

The code worked fine with reading just one file but it started giving permission errors when I put it in a loop.

The exact error message was :

Error using fopen
Invalid permission.

Error in physexp1 (line 2)
    fid = fopen('%d.asc', i, 'r');

How would I fix this?

Thanks

Answer 1

[Bhargavi Maganuru]

Hi,

It might be an unappropriate way to format string using specifiers inside fopen. Instead you can try specifying filename seperately inside for loop and give that as input to fopen.

for i = 1:30
    filename = sprintf('%d.asc', i);
    fid = fopen(filename, 'r');
    fclose(fid);
end