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Why is R2020a slow to return errors?

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KAE
KAE on 11 Aug 2020
Answered: KAE on 8 Oct 2020
When I switched to R2020a (Windows), I noticed that a simple error at the command line takes about 20 seconds to resolve,
% Simple mistyping of command "min" cause Matlab to hang for 20 seconds
muin(rand(1,1000));
Unrecognized function or variable 'muin'.
% Nonsense command causes similar hang time
asdfasdfkkasdfasdf
Unrecognized function or variable 'asdfasdfkkasdfasdf'.
Any suggestions of how to eliminate this? I am curious which internal process is hanging.

Accepted Answer

Steven Lord
Steven Lord on 11 Aug 2020
Do you have any network directories on your MATLAB path? If MATLAB has to search those network directories to determine if there's a potential match to suggest as a correction (the "Did you mean" functionality) that could slow the error process down.
Try temporarily removing those directories from the MATLAB path and check if the problem is resolved.
  1 Comment
KAE
KAE on 11 Aug 2020
All path directories are on my local C: drive. However most are under a local OneDrive directory on the C drive. I never had a slowdown prior to R2020a with this path. As suggested, I removed the local OneDrive folder off my path, restarted, and found errors were resolved quickly. Unfortunately I am stuck with having path directories under the local OneDrive folder.
As a workaround, I stopped Matlab from searching for a correction file for a mistyped function by going to the Environment > Preferences tab on the bar at the top of the command line window, as shown below. A mistyped function error is again returned quickly, and it's worth the lack of suggested function names when I mistype them. Note in my 'muin' example above, it wasn't suggesting the correct function name 'min' anyway!

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More Answers (1)

KAE
KAE on 8 Oct 2020
Here is more info on fixing this problem, including the useful function RemoveDrivesFromHistory.

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