How do I optionally disable code for a missing toolbox?

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Margaret Pinson 2019-6-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466347-how-do-i-optionally-disable-code-for-a-missing-toolbox

评论： Edric Ellis 2019-6-11

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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the cyclist 2019-6-10

Here is the link to Walter's question that addresses this.

Edric Ellis 2019-6-11

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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the cyclist 2019-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/466347-how-do-i-optionally-disable-code-for-a-missing-toolbox#answer_378571

在 MATLAB Online 中打开

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

license('test','Distrib_Computing_Toolbox')

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Walter Roberson 2019-6-10

在 MATLAB Online 中打开

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.