Mean value of array

I need to calculate the mean of [1 2 ; 9 10],[2 3 ; 10 11] [3 4 ; 11 12] ,[4 5 ; 12 13] ....and make 3*7 matrix of the mean values of A(=4*8 matrix).

Does anyone has idea how to make it?

A=[1 2 3 4 5 6 7 8 ;
   9 10 11 12 13 14 15 16;
   17 18 19 20 21 22 23 24;
   25 26 27 28 29 30 31 32]

[Alex Sune]

The question is not clear. Can you show an example of input and the desired output?

[Chihiro Omori]

I would like the output below.

A_mean = [5.5, 6.5, 7.5, 8.5, 9.5, 10.5, 11.5;

13.5 14.5, 15.5, 16.5, 17.5, 18.5, 19.5;

21.5, 22.5, 23.5, 24.5, 25.5, 26.5, 27.5]

The first row represents that ... 5.5 = ((1+2+9+10)/4) , 6.5 = ((2+3+10+11)/4), ...

The second row represents ... 13.5 = ((9+10+17+18)/4), ......

[Guillaume]

You've been given two methods to achieve that output.

Answer 1

[Guillaume]

Trivially solved with a convolution

A=[1 2 3 4 5 6 7 8 ;
   9 10 11 12 13 14 15 16;
   17 18 19 20 21 22 23 24;
   25 26 27 28 29 30 31 32]

conv2(A, ones(2)/4, 'valid')  %comvolve with [0.25, 0.25; 0.25, 0.25]

Answer 2

[KSSV]

Refer this: https://stackoverflow.com/questions/29040688/overlapping-sliding-window-over-an-image-using-blockproc-or-im2col

[Alex Sune]

+1