Hi Archer,
The problem is that MATLAB doesn't know how to properly index into C. I would suggest a slight rewrite, using parfeval instead of parfor.
% Assumed a, b, c, d, l, m, n, subsize, A, B are all define above
% Using a nested function so that input arguements don't need to be passed to unitOfWork
p = gcp;
for r = 1:d
f(r) = p.parfeval(@unitOfWork,5);
end
for r = 1:d
[~,i,j,s,t,tmp] = f.fetchNext();
C((i-1)*subsize+1:s,(j-1)*subsize+1:t) = tmp;
end
function [i,j,s,t,tmp] = unitOfWork()
i = mod(r-1,b)+1;
j = floor(r-1/a)+1;
s = min(i*subsize,m); t = min(j*subsize,n);
tmp = zeros(s-(i-1)*subsize,t-(j-1)*subsize);
for k = 1:c
q = min(k*subsize,l);
tmp = tmp+A((i-1)*subsize+1:s,(k-1)*subsize+1:q)*B((k-1)*subsize+1:q,(j-1)*subsize+1:t);
end
end
end
