Call library with parfor

Question

arnaud ensberg 2016-1-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/265604-call-library-with-parfor

评论： Bernie St 2017-8-24

I use javaplex it's a library, with for i can use it without any error:

   for i=1:size(mat,1)
         max_dimension = 3; 
         max_filtration_value = 1000; 
         num_divisions = 10000;
         %options.max_filtration_value = max_filtration_value;
         %options.max_dimension = max_dimension - 1;    
        % fprintf('on est à l indice  %d\n', i); 
         maColonne = mat(i,:); %cela va mettre ta i_ème colonne dans la variable maColonne
         matricepos = vec2mat(maColonne,3);
         point_cloud=matricepos; 
         stream = api.Plex4.createVietorisRipsStream(point_cloud, max_dimension, max_filtration_value, um_divisions);
         end

but when i use the same code with parfor, i have this error :

Error: MATLAB cannot determine whether "api" refers to a function or variable.
See Parallel for Loops in MATLAB, "Unambiguous Variable Names".
    parfor i=1:size(mat,1)
         max_dimension = 3; 
         max_filtration_value = 1000; 
         num_divisions = 10000;
         %options.max_filtration_value = max_filtration_value;
         %options.max_dimension = max_dimension - 1;    
        % fprintf('on est à l indice  %d\n', i); 
         maColonne = mat(i,:); %cela va mettre ta i_ème colonne dans la variable maColonne
         matricepos = vec2mat(maColonne,3);
         point_cloud=matricepos; 
         stream = api.Plex4.createVietorisRipsStream(point_cloud, max_dimension, max_filtration_value, num_divisions);
         end

the error comme from this line:

stream = api.Plex4.createVietorisRipsStream(point_cloud, max_dimension, max_filtration_value, num_divisions);

how can i call a function form library on parfor

please

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Edric Ellis 2016-1-29

在 MATLAB Online 中打开

Are you calling javaaddpath on the client? If so, you'll need to call javaaddpath on the workers. Something like this perhaps:

spmd
    javaaddpath('path/to/javaplex');
end

Bernie St 2017-8-24

Hi Arnaud, did you manage to solve this problem? I am trying to use javaplex in parfor loops and have the exact same error message. Unfortunately both adding the java path in the parfor loops as well as importing within the loop did not solve the problem for me.

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Call library with parfor

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