How to use a parfor loop inside a for loop?

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Dominik Mattioli
Dominik Mattioli am 9 Mär. 2018
Kommentiert: Dominik Mattioli am 9 Mär. 2018
I have a for loop with variables that have dependency. Within that loop I would like to use parfor to perform a costly operation on a variable that is independent across iterations. Below I made an example; say that I want to perform myFun on each entry in the row (in parallel) corresponding to the iteration of the for-loop.
N = 10;
inputVar = [randi(100,N,1),zeros(N,1)];
out = cell(N,2)
for idx = 1:N
inputVars(idx,2) = idx;
parfor jdx = 1:2
out{jdx,kdx} = myFun(inputVars(jdx,kdx))
I'm new to parallel computing. Not sure if this example is a good one. I can provide a better example if asked.

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Walter Roberson
Walter Roberson am 9 Mär. 2018
Generally speaking you can do that. However, parfor will have an easier job if you write to an output that is indexed only by the loop index and possibly the : (colon) operator. For example,
temp_input = inputVars(:,kdx);
parfor jdx = 1 : 2
temp_out{jdx} = myfun(temp_input(jdx));
out(:,kdx) = temp_out;
  3 Kommentare
Dominik Mattioli
Dominik Mattioli am 9 Mär. 2018
Good point! Thank you!

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