how can I get the mean of each two columns of a matrix ?

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Niki 2016-7-8

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评论： Star Strider 2016-7-8

采纳的回答： Star Strider

I have a big matrix and I want to get the average of each 2 columns,

Is there any function to do that ?

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Answer 1

Star Strider 2016-7-8

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I’m not quite sure what you want.

See if this works for you:

M = randi(99, 10);
RM = reshape(M, 10, 2, [])
Mmean = mean(RM,2)

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Niki 2016-7-8

编辑：Niki 2016-7-8

@Star Strider average of each two columns should give me 1 column . means average of each element . Let say if I have 100 columns in my original data, it should give me 50 columns

Star Strider 2016-7-8

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I forgot a squeeze call. This will do what you want, and should work with any matrix:

M = randi(99, 10);                                  % Create Data
RM = reshape(M, size(M,1), 2, [])                   % Reshape
Mmean = squeeze(mean(RM,2))                         % Desired Result

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Answer 2

Thorsten 2016-7-8

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mean(reshape(mean(X), 2, []))

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Niki 2016-7-8

编辑：Niki 2016-7-8

@Thorsten average of each two columns should give me 1 column . means average of each element . Let say if I have 100 columns in my original data, it should give me 50 columns

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