Logical indexing within parfor statement

Question

Javier 2011-8-1

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https://ww2.mathworks.cn/matlabcentral/answers/12828-logical-indexing-within-parfor-statement

Hi. I have a problem with parfor and an indexing. As you can see in my code below, I get a group of elements of a matrix using find, then I use these indexes to select the elements I need to. So it's said to me that is an error due to the way I've indexed. Any suggestion?

baseDatosFilaTemp=zeros(1,8);
tempBaseDatosIDs=zeros(cbdAcelerados,1);
tempBaseDatosIDs=baseDatos(:,columnaID);
parfor n=1:fbdAcelerados
bdAceleradosFila=zeros(1,8);
bdAceleradosFila=bdAcelerados(n,:);
indice=find(tempBaseDatosIDs==bdAceleradosFila(colAcID));
 if(~isempty(indice))
  if(bdAceleradosFila(colAcT)>=0)
     baseDatosFilaTemp=baseDatos(indice,:);%*<-HERE TROUBLE*
     baseDatosFilaTemp(columnaV)=incrVel+baseDatosFilaTemp(columnaV);
     if(baseDatosFilaTemp(columnaV)>vMax)
        baseDatosFilaTemp(columnaV)=vMax;
     end
     baseDatos(indice,:)=baseDatosFilaTemp;
  end
 end
end

Thanks,Javier

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Javier 2011-8-1

The expected output is an update of baseDatos matrix elements which are in the matrix bdAcelerados too. The issue to use pafoor is the dimension of baseDatos which could be 500x8 for example.

Javier 2011-8-1

Sorry the example:

baseDatos=[ 10 22 1 1 1 1 1 2

20 33 1 2 4 5 7 9]

bdAcelerados =[ 2 2 2]

Then the update will be:

baseDatos=[ 10+incrVel 22 1 1 1 1 1 2

20 33 1 2 4 5 7 9]

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Answer 1

Jan 2011-8-1

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You've stated, that there are "troubles". I guess, that this does not mean an error, but a warning of MLint?! Does it say, that you can omit the FIND? Then I suggest:

% Omit this useless line: bdAceleradosFila=zeros(1,8);
bdAceleradosFila=bdAcelerados(n,:);
indice = (tempBaseDatosIDs==bdAceleradosFila(colAcID));
if any(indice)
  if bdAceleradosFila(colAcT) >= 0
     baseDatosFilaTemp = baseDatos(indice,:);
...

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Javier 2011-8-2

Hi Jan, thanks for replying!

Yes I have got a warnning produced by the parfor loop, to be precise, due to the use of baseDatos. I've made the changed you have suggested to me, but despite them, I still get the warnning...

Thanks!

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