I have a 100x100 matrix, i need average of 10-10 row values, so that my matrix become 10x100

I have a 100x100 matrix, i need average of 10-10 row values, so that my matrix become 10x100

Answer 1

[KSSV]

A = rand(100) ;

m = 10 ; n = 100 ;
l = size (A) ./ [m n];
T = mat2cell (A, repmat (m, l(1), 1), repmat (n, l (2), 1));

M = cellfun(@mean,T,'un',0) ;

M = cell2mat(M) ;

Answer 2

[Stephen23]

This is actually really simple with reshape. Here is an example with a 6x4 matrix where I average every 3 rows to give a 2x4 matrix:

>> M = randi(9,6,4)
M =
   8   6   8   4
   3   7   9   8
   5   2   5   6
   8   2   8   6
   2   3   2   3
   4   3   4   7
>> N = 3; % number of rows to average over
>> R = size(M,1)/N % final number of rows: must be integer!
R =  2
>> reshape(mean(reshape(M,N,[]),1),R,[])
ans =
   5.3333   5.0000   7.3333   6.0000
   4.6667   2.6667   4.6667   5.3333

And checking the first value by hand:

>> mean([8,3,5])
ans =  5.3333