Incorrect results from parfor

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Anthony 2014-1-6

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https://ww2.mathworks.cn/matlabcentral/answers/111594-incorrect-results-from-parfor

评论： Anthony 2014-1-9

hi, thanks in advance for your help. i am constructing a function which contains a parfor loop, which i am unfamiliar with. Although it runs, the results are incorrect; if i replace the 'parfor' with 'for' (nothing else changed), then the results are correct, with much longer running time. fun_wn and fun_idf_HS are two user-defined functions. The new function just prints out their values when i and j satisfies certain condition. (symptom: x and y_sp{j} are printed out correctly, but feval(fun_1,x,y_sp{j}) and feval(fun_2,y_sp{j}) are not.) thanks a looot!

function output = fun_wn_HS4(x)
  global d_HS4_o prescore_HS4 vocabulary_HS4
  fun_1 = @fun_wn;
  fun_2 = @fun_idf_HS;
  output = zeros(size(d_HS4_o,1),1);
      parfor i=1:size(d_HS4_o,1)
          y_sp = strtrim(strsplit(d_HS4_o{i},' '));
          for j=1:length(y_sp)
            if i==506 && j==13
             x
             y_sp{j}
             feval(fun_1,x,y_sp{j})
             feval(fun_2,y_sp{j})
            end
          end
       end
end

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回答（1 个）

Walter Roberson 2014-1-7

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在 MATLAB Online 中打开

Unless the user is passing function names to you, use

fun_1(x,y_sp{j});
fun_2{y_sp{j});

instead of using feval()

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Edric Ellis 2014-1-7

GLOBAL data is not automatically transferred from the MATLAB client to the workers running the body of the PARFOR loop. So, you either need to do this manually, or ideally you'd re-work the functions to rely on explicit input arguments.

Anthony 2014-1-9