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

[Pulkit Goel]

Saving file name in a variable worked for me. Try running the following code:

for i = 1:30
    name=string(i)+'.asc';
    fid = fopen(name, '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

I guess creating the name of file in fopen is causing the problem.