Parpool fails to run in between other lines of code

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Richard Fiifi Annan
Richard Fiifi Annan 2021 年 12 月 6 日
The following code returns the error below in MATLAB R2020b, Windows 10.
However, after restarting MATLAB and running only ppp=parpool(4) on a fresh script, it works. Has anyone ever experienced such a thing? I need to perform same operation on 6 other climate variables, so speed is of the essence. Running a normal for-loop is slow; therefore, is very discouraging.
Precips = ".\ECMWF_Datasets\cru_ts_4.05\data\pre\"
Times = ncread(Precips, "time");
Times = double(Times) * 24 * 3600;
ref_date = datestr('1900-01-01 00:00:00.0');
Times = datetime(Times,'ConvertFrom','epochtime','Epoch',ref_date);
XXX = ncread(Precips, "pre"); % 720 x 360 x 1440
ppp = parpool(4); % returns the error below
parfor i = 1:length(Times)
"Perform some operations on XXX"
Error using parpool (line 149)
Parallel pool failed to start with the following error. For more detailed information, validate the profile 'local' in the Cluster Profile Manager.
Caused by:
Error using parallel.internal.pool.InteractiveClient>iThrowWithCause (line 678)
Failed to start pool.
Error using parallel.Job/submit (line 355)
Unable to use a value of type cell as an index.


Raymond Norris
Raymond Norris 2021 年 12 月 6 日
I'm guessing it's something to do with your environment. When I test with, it works fine. Is your code in a script or a function? If a script, save it as a function and rerun your code to see if that shields it from the error.
  1 件のコメント
Richard Fiifi Annan
Richard Fiifi Annan 2021 年 12 月 7 日
Hello @Raymond Norris, thanks very much for the response. You're right, the culprit was some directories which I had added to MATLAB's path at the beginning of the script. I just had to comment those lines out.


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