function timingGroupfilter
data = (1:5000)';
groups = repelem(1:length(data)/10,10)';
p = randperm(length(data));
data = data(p);
groups = groups(p);
tic
for k = 1:600
G = groupfilter(data,groups,@(x) x == max(x));
end
toc
end
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