Invalid file identifier in Parfor loop

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xiaohuo 2022-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/1668809-invalid-file-identifier-in-parfor-loop

评论： xiaohuo 2022-3-11

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How to correct this error when using the parfor loop? Any suggestion to solve this issue? Thanks.

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

filename01 = "D:\...\testParfor"; % filename01 file parth 
parfor j = 1:nk2_node
        % File path
        filename_HD = sprintf('%s%s%d',filename01,"\zone_case0\profile_",j); 
        Cal_cont = HD_Nod_Inf(filename_HD);
        ...
 end
 
    
    

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Walter Roberson 2022-3-11

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    for i=1:199 
        k = i + Line_nod_sub-1-199;
        Cal_cont(i,1:22) = str2num(newtline_Nod_sub{k}); %  error
    end

Suppose that 50 lines were read, so Line_nod_sub = 50. First iteration of the loop, i is 1, and k = 1 + 50 - 1 - 199 which is 51-200 which is -149 . Out of range.

Suppose that 205 lines were read, so Line_nod_sub = 205. First iteration of the loop, i is 1, and k = 1 + 205-1-199 = 6, which is okay. Last iteration of the loop, i is 199, and k = 199 + 205 - 1 - 199 = 204, which looks okay.

So I guess your loop might be okay -- but not until after you enforce that Line_nod_sub is at least 200.

xiaohuo 2022-3-11