Parfor-loop not working, how to fix? - matlab

Question

I am trying to parallize two of my for-loops and run it on a remote cluster.
I am using matlabpool open local 12 at the beginning with matlabpool close at the end. The problem I am running into is that my parfor-loop cannot use my matric properly and I am not sure how I would rewrite it so that it works.
H = hadamard(n);
H = [H;-H];
P = setdiff(P,H,'rows');
[r,c] = size(P);
A = zeros(n,r);
parfor i=1:r
for j=1:n
d = P(i,:) + H(j,:);
A(j,i) = sum(d(:) ~= 0);
end
end
and:
u2Had = cell(2,r);
parfor i =1:r
u2Had{1,i} = min(A(:,i));
MinHadIndex = find(A(:,i) == u2Had{1,i});
u2Had{2,i} = MinHadIndex;
end
Those are the two segments of the code I am trying to parallize. Any help is much appreciated and if I need to add anymore information please ask.

Answer 1

I don't know what your problem is in the first part as it works fine (perhaps if you defined P better)
regarding the second part, you can only send information to and from parloops in narrow cases.
Here change your code to the following:
u2HadT = cell(1,r);
parfor i =1:r
temp = min(A(:,i));
MinHadIndex = find(A(:,i) == temp);
u2HadT{i} = {temp;MinHadIndex};
end
u2Had = cell(2,r);
for i =1:r
u2Had{1,i} = u2HadT{i}(1);
u2Had{2,i} = u2HadT{i}(2);
end