MATLAB: How Zero padding inside a matrix

padsignal processingzerozero padding

Hello, how can i zero pad inside a matrix ? For example :
if true
  % code
end
A = [ 1 2 3 4
    5 6 7 8
    9 10 11 12
    13 14 15 16]
And i want 
A = [ 1 2 3 4
    5 6 7 8
    0 0 0 0
    0 0 0 0
    ......
    0 0 0 0 
    0 0 0 0
    9 10 11 12
    13 14 15 16]
I know padarray can zero pad but only outside not in the inside.. Thank you.

Best Answer

Create a second matrix of zeros, then assign the appropriate rows of your first matrix to the rows you want in the second matrix:
A = [ 1 2 3 4
    5 6 7 8
    9 10 11 12
    13 14 15 16];
Desired_Rows = 10;                                          % Pick A Number
B = zeros(Desired_Rows, size(A,2));
B([1:2 end-1:end],:) = A
B =
       1     2     3     4
       5     6     7     8
       0     0     0     0
       0     0     0     0
       0     0     0     0
       0     0     0     0
       0     0     0     0
       0     0     0     0
       9    10    11    12
      13    14    15    16
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