Arrayfun will only hide the loop, so it will never be faster than a plain for loop.
What you need to do is change your function so it allows array inputs. As far as I can tell, there is only a small change required.
fn=websave('data.mat','https://www.mathworks.com/matlabcentral/answers/uploaded_files/780763/nodetraffic.mat');
S=load(fn);
nodetraffic=S.nodetraffic;
method1(nodetraffic)
method2(nodetraffic)
%warm up the run online engine
timeit(@()method1(nodetraffic));timeit(@()method2(nodetraffic));
timeit(@()method1(nodetraffic)),timeit(@()method2(nodetraffic))
function count=method1(nodetraffic)
count = 0;
for i = 1 : length(nodetraffic)
if (standard_deviation_distance(nodetraffic, nodetraffic(i)) > 6)
count = count + 1;
end
end
end
function count=method2(nodetraffic)
d=standard_deviation_distance(nodetraffic, nodetraffic);
count=sum(d>6);
end
function dist = standard_deviation_distance(v, x)
standard_deviation = std(v);
dist = (x - mean(v)) ./ standard_deviation;
% ^
% only change required here
end
