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How do I optionally disable code for a missing toolbox?

Asked by Margaret Pinson on 10 Jun 2019
Latest activity Commented on by Edric Ellis
on 11 Jun 2019
I am writing code to share with other researchers. I want to use the parallel processing toolbox for speed savings. Other researchers don't have the parallel processing toolbox.
Is there a way for everyone to use the same function? That is, skip or disable the parallel processing functions, if that toolbox is not available? Right now, my only option is to have two versions of every function, which encourages programming errors. When I was programming in C or C++, I would have solved this problem with compile flags. I tried an input flag, but this fails. MATLAB won't run a function that includes parfor if the parallel processing toolbox is missing.

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license() with 'test'
One of my Questions lists all of the codes that I could find.
Here is the link to Walter's question that addresses this.
parfor loops should work correctly whether or not Parallel Computing Toolbox is installed. (Other things such as spmd and parfeval do not, unfortunately...). Of course, if PCT is not installed, a parfor loop will run in serial mode.

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1 Answer

Answer by the cyclist
on 10 Jun 2019

All credit to Walter, but I believe you'll want to do this test:
license('test','Distrib_Computing_Toolbox')

  2 Comments

Exactly.
Note though that this approach has the weakness that it tests whether the user is licensed for something, not whether the thing is installed. There are other approaches that can test whether software is installed, but not whether it is licensed. If you look at the chart I posted, you can use
ver('distcomp')
to probe whether Parallel Computing is installed.
Internally, we tend to use something more like:
isPCTInstalled = exist('gcp', 'file') == 2;
to check whether Parallel Computing Toolbox is installed.

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