How to separate monthly data from yearly?

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eko supriyadi
eko supriyadi 2018-2-14
hello, everyone. I have a matrix of 15x18x213 size.
15 is longitude
18 is latitude, and
213 is time (month), the year start 2000-2017
my problem is.. how I can grab standard deviation for every month so I get new a matrix with size 15x18x12.
I'm tried with this code to looking for mean and work
%the code, work for mean
for k = 1:12
ind = month==k;
sst(:,:,k) = nanmean(data(:,:,ind),3);
end
%the code, not working
for k = 1:12
ind = month==k;
sst(:,:,k) = nanstd(data(:,:,ind),3);
end
I need an advance for it.. tks

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