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Can you do a parfor if Parallel Toobox is present else do a for

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John Fox
John Fox 2017-6-29
评论： Walter Roberson 2017-6-30
Is there a way: if the Parallel Toolbox is present then do the following loop with a parfor else use a for
I realize that ~isempty(which('parfor')) is true if the Parallel toolbox is present. I want to do:
if(~isempty(which('parfor')))
parfor j = 1:Lz
else
for j = 1:Lz
end
Next come the body of the loop.
Also I would like to do:
if(Lx <= 30000) % Small enough don't need parallel
for j = 1:Lz
else
parfor j = 1:Lz
end
Next comes the body of the loop.
Matlab complains "Illegal use of reserved keyword "else"."

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采纳的回答

Walter Roberson
Walter Roberson 2017-6-29
You do not need to do this. If you do not have the Parallel Computing Toolbox, parfor is automatically processed as a for loop.
  2 个评论
John Fox
John Fox 2017-6-30
The answer was:
if(Lx <= 30000) % Small enough don't need parallel for j = 1:Lz % do what you want end else parfor j = 1:Lz % do what you want end end
I already figured out that this would work. However, both "do what you want" are the same 2 pages of code. I was hoping to avoid having two copies of two pages of code.
This seems like such an obvious issue. Is there no elegant solution other than just repeating lots of code?

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