Error using histogram in parlor-loop
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Jens Lindahl
il 30 Apr 2019
Commentato: Edric Ellis
il 12 Set 2019
Hey,
I have trouble using histogram in a parfor-loop. Below is a minimal-working-example of my problem:
parfor idx = 1:2
x = randn(1,50*idx);
f = figure()
histogram(x,'Normalization','pdf')
drawnow
end
This gives me the response:
Error using histogram (line 140)
Transparency violation error.
See Parallel Computing Toolbox documentation about Transparency
Error in untitled6 (line 3)
parfor idx = 1:2
I get the error with both R2018a and R2018b
Best regards,
Risposta accettata
Edric Ellis
il 1 Mag 2019
Unfortunately, histogram tries to extract the name of the input variable, and this causes the transparency violation. You can work around this problem by hiding the call to histogram inside an anonymous function, like this:
histFcn = @(x) histogram(x, 'Normalization', 'pdf');
parfor idx = 1:2
x = rand(1, 50*idx);
histFcn(x);
end
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