Hello, I am trying to suppress following output 'Evaluating tall expression using the Parallel Pool 'local':' for gather function. Unfortunately it is in a parfor loop so I can't use evalc to suppress it. Can anyone help me?
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Angelo Scacciavillani
on 19 May 2018
Commented: Angelo Scacciavillani
on 22 May 2018
Hello, I am trying to suppress following output 'Evaluating tall expression using the Parallel Pool 'local':' for gather function. Unfortunately it is in a parfor loop so I can't use evalc to suppress it. Can anyone help me?
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Accepted Answer
Preethi Ayyamperumal
on 22 May 2018
"evalc" violates transparency in parfor loops and hence restricted. Such transparency restrictions apply only to the direct body of the parfor construct, and not to any functions called from there.
As a workaround, hide your call to evalc('gather(argument)') in a MATLAB function and call the function from "parfor" loop to suppress the output of "gather" function.
Refer to the following code for example:
ds = datastore('airlinesmall.csv');
varnames = {'ArrDelay', 'DepDelay'};
ds.SelectedVariableNames = varnames;
ds.TreatAsMissing = 'NA';
parfor i = 1:4
tt = tall(ds)
a = tt.ArrDelay;
m = mean(a,'omitnan');
s = std(a,'omitnan');
one_sigma_bounds = [m-s m m+s];
supress_gather_output(one_sigma_bounds,a);
end
function supress_gather_output(one_sigma_bounds,a)
[t,sig1] = evalc('gather(one_sigma_bounds)');
[max_delay, min_delay] = evalc('gather(max(a),min(a))');
end
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