How to create matrix with Standard deviation from every 5 columns of another matrix?

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Kiryl Zhaliazka
Kiryl Zhaliazka 2021-9-30
回答： the cyclist 2021-9-30
I have matrix 100x20, how to create a new matrix with SD of evey 5 columns from the first one, to have 100x4 new matrix.

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the cyclist
the cyclist 2021-9-30
Here is one way:
% Pretend data [Use your actual data instead]
M = randn(100,20);
% Reshape into the slices needed for standard deviation
M3 = reshape(M,100,5,4);
% Take standard deviation along dimension 2
S3 = std(M3,0,2); % FYI, the 0 here means "use sample, not population std dev". (See documentation.)
% Reshape back to 2-d
S = reshape(S3,100,4);

更多回答（1 个）

Walter Roberson
Walter Roberson 2021-9-30
Ran in:
M = rand(100,20);
Mstd5 = reshape(std(reshape(M, size(M,1), 5, []), [], 2), size(M,1), []);
size(Mstd5)
ans = 1×2
100 4

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