Replicate Element-wise in matrix [duplicate]

Answer 1

Let the data be defined as

A = [1 2; 3 4];
R = 2; %// number of repetitions of each row
C = 2; %// number of repetitions of each column. May be different from R

Two possible approaches are as follows:

1. The simplest method is to use indexing:

   B = A(ceil(1/R:1/R:size(A,1)), ceil(1/C:1/C:size(A,2)));
   

2. If you really want to do it with repmat, you need to play with dimensions using permute and reshape: move original dimensions 1, 2 to dimensions 2, 4 (permute); do the repetition along new dimensions 1, 3 (repmat); collapse dimensions 1, 2 into one dimension and 3, 4 into another dimension (reshape):

   [r c] = size(A);
   B = reshape(repmat(permute(A, [3 1 4 2]), [R 1 C 1]), [r*R c*C]);
   

Example result for R=2, C=3 (obtained with any of the two approaches):

B =
     1     1     1     2     2     2
     1     1     1     2     2     2
     3     3     3     4     4     4
     3     3     3     4     4     4