parfor with sliced and reduction variable

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lingyan
lingyan 2013-6-20
Hello, i'm trying to use parfor in this way:
oldc = c(:,index);
delta = thirds(biggy+1);
newc_left = oldc(:,ones(1,lssize));
newc_right = oldc(:,ones(1,lssize));
f_left = zeros(1,lssize);
f_right = zeros(1,lssize);
parfor i = 1:lssize
lsi = ls(i);
newc_left(lsi,i) = newc_left(lsi,i) - delta;
newc_right(lsi,i) = newc_right(lsi,i) + delta;
[f_left(i), con_left(i), fflag_left(i)] = CallObjFcn(Problem,newc_left(:,i),a,b,impcons,calltype,varargin{:});
[f_right(i), con_right(i), fflag_right(i)] = CallObjFcn(Problem,newc_right(:,i),a,b,impcons,calltype,varargin{:});
fcncounter = fcncounter + 2;
end
There is something wrong with the use of newc-left. can I use parfor in this case and how?

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Edric Ellis
Edric Ellis 2013-6-20
编辑：Edric Ellis 2013-6-20
You could try something like this so that you're updating whole columns of newc_left and newc_right:
numRows = size(oldc, 1);
...
parfor ...
increment = zeros(numRows, 1);
increment(lsi(i)) = delta;
newc_left(:,i) = newc_left(:,i) - increment;
newc_right(:,i) = newc_right(:,i) + increment;
...
  1 个评论
lingyan
lingyan 2013-6-20
Thanks a lot! Now it works. Can you please explain where am i wrong and why?

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