Hi,
always use parfor as loop type. When no worker pool is open the parfor loop runs as for loop but backwards. But that should not matter. Note: In R2013b there was a new feature introduced which automatically open a new parallel pool when SPMD or PARFOR is executed. You might want to disable that feature in the parallel preference setting of your MATLAB in the case you use R2013b or newer.
Or in the case you dont like that put the whole body of the loop in a function which takes the index as input, e.g.
if run_in_parallel
parfor i=1:n
result(i) = myfun(i, other_args)
end
else
for i=1:n
result(i) = myfun(i, other_args)
end
end
