textscan desnt work in forloop

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Divya Patel 2019-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/491461-textscan-desnt-work-in-forloop

评论： Walter Roberson 2019-11-19

okay so this is the coad, the text scan fuction works and the whole coad runs without the for loops, but when addiing the forloops the coad doesn work the error i m getting is :

Error using textscan

Invalid file identifier. Use fopen to generate a valid file identifier.

Error in forllooptest (line 7)

c = textscan(fid,'%f %f %f %f %f %f %f','HeaderLines', 12);

for i = 0
    for j = 0
        for k = 0
            for l = 0:8
                b = sprintf('cl%d%d%d%d.txt',i,j,k,l);
                fid = fopen(b);  
                c = textscan(fid,'%f %f %f %f %f %f %f','HeaderLines', 12);
                fclose(fid);
                %delete(cl.txt);
                % Separate boundary points
                d = c{:,3}(1,:);
                %if (exist(saveFlnmAF,'file'))
                %delete(saveFlnmAF);
                %end
                g(i) = d
           
                [val, idx] = maxk(g,5)
            end
        end
    end
end

Please does someone know how to correct this. thank you

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Divya Patel 2019-11-16

i have a follow up question!, how would i tell it to skip that fild read if the line is empty, for textscan so it donest give me that error!

Walter Roberson 2019-11-19

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if fid < 0; continue; end

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回答（1 个）

Raunak Gupta 2019-11-19

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Hi,

Hope the file identifier error is resolved. For the follow up question you may read the file from textscan even if it is empty and then can check if the resultant cell array is empty or not. If it is empty, then you may simply skip that iteration in the loop.

For checking if the cell array is fully empty you may use following

number = sum(cellfun(@isempty,c) == 1)

This number should be zero for fully empty text file.

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MATLAB Programming Classes Construct and Work with Object Arrays

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