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(par)for k=1:N end; select for or parfor loop without code replication

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I like to use for-loop or parfor-loop with function input flag. One way to do that is using if-else with code replication. I wonder is there a cleverer way?
% solution based on code replication
function foo(parflag)
if parflg==true
parfor k=1:3
% processing codes
end
else
for k=1:3
% copy of processing codes
end
end
end
%% wondering how to make this idea work?
function hoo(parflag)
if parflag==true
forString = str2func('parfor')
else
forString = str2func('for')
end
forString k=1:3
% processing codes
end
end

Accepted Answer

Matt J
Matt J on 23 Aug 2023
Edited: Matt J on 23 Aug 2023
You can avoid replicating the loop code as follows.
numWorkers={}; % or whatever
if ~parflag
numWorkers={0};
end
parfor (k=1:3, numWorkers{:})
% processing codes
end
Be mindful, though, that parfor loops have stronger requirements on the code structure, and you would be limiting yourself to that, even when running serially.
  13 Comments
Simon
Simon on 24 Aug 2023
Yes, that flexibility works for me. For example, when I am not doing anything but programming Matlab, I can set it to the maximum number of workers my compouter has. But when I heavily multitask, I can set numWorkers, say, 2 or 3, and let other cores to work on non-Matlab tasks. (I guess that's how my Mac would work.)

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