How to subtract Mean from Matrix along columns

Question

JFz 2017-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/367418-how-to-subtract-mean-from-matrix-along-columns

编辑： John D'Errico 2017-11-16

Hi,

In subtraction, there is an example of subtract mean from matrix: A - mean(A) and it works well. But I have a matrix A of 15X1000, and I want to subtract the mean mean(A, 2) along the 1000 columns, how to do that? Thanks Jennifer

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Answer 1

JFz 2017-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/367418-how-to-subtract-mean-from-matrix-along-columns#answer_291527

With the above help, found that bsxfun works for versions before 2017a:

bsxfun(@minus, A, mean(A, 2))

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Answer 2

KL 2017-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/367418-how-to-subtract-mean-from-matrix-along-columns#answer_291522

编辑：KL 2017-11-16

Just the same way, A-A_mean. Here's an example with 5 columns,

>>A = reshape(1:25,5,5) %dummydata
A =
       1     6    11    16    21
       2     7    12    17    22
       3     8    13    18    23
       4     9    14    19    24
       5    10    15    20    25
>>A_mean = mean(A,2)
A_mean =
      11
      12
      13
      14
      15
>>A = A-A_mean
A =
     -10    -5     0     5    10
     -10    -5     0     5    10
     -10    -5     0     5    10
     -10    -5     0     5    10
     -10    -5     0     5    10