Invalid permission error with fopen()

Question

DONGUK KIM 2020-6-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/543881-invalid-permission-error-with-fopen

回答： Pulkit Goel 2020-6-8

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

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Answer 1

Pulkit Goel 2020-6-8

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/543881-invalid-permission-error-with-fopen#answer_447992

在 MATLAB Online 中打开

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