How to perform repeated calculations on a different bin

Question

Charlie Finnie 2016-10-25

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关闭： MATLAB Answer Bot 2021-8-20

I have split my data into bins (5 million year spacing through time) and then performed calculations to remove NaNs, calculate the mean and calculate the standard deviation of the first bin (0-5million years).

I was just wandering if there is an easy way of repeating all of these calculations for the remaining bins (5-10myr, 10-15myr....etc)?

Thanks Charlie

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Adam 2016-10-25

Depends how exactly you have split your data up, but assuming you put your code in a function then you can apply that function to any bin you choose or all bins in succession.

Chaya N 2016-10-25

How are you storing each of these bin data? (Arrays/ cells/ structures)

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Answer 1

Steven Lord 2016-10-25

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Use discretize to bin your data then use the output from discretize as the subs input to accumarray.

% Sample data
n = 10;
x = n*rand(100, 1);
y = (1:100).';
% Bin it and accumulate the data in each bin
bin = discretize(x, 0:n);
A1 = accumarray(bin, y, [n 1], @mean);
% Accumulate the data in the bins using a FOR loop
A2 = zeros(n, 1);
for k = 1:n
  A2(k) = mean(y(bin == k));
end
% These two results should be the same
[A1, A2, A1-A2]

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Answer 2

Chaya N 2016-10-25

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编辑：Chaya N 2016-10-25

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Put all the bin data into a cell array and use cellfun

 all_bins_raw = {bin1,bin2,....,binN}; % put all raw data in one cell array
 all_bins = cellfun(@(x) x(~isnan(x)),all_bins_raw,'UniformOutput',0); % Remove NaN's
 bin_means = cellfun(@mean, all_bins); 
 bin_sds = cellfun(@std, all_bins);