MATLAB: Copying a matrix into another larger matrix multiple times

cell arraymultiple-copying

Hi all, I am trying to write a script that creates a larger matrix B from a smaller matrix A = [1;1;1;2;2;2;3;3;3;4;4;4] whereby A is copied into B in N times. E.g if N = 4, B = [1;1;1;2;2;2;3;3;3;4;4;4;1;1;1;2;2;2;3;3;3;4;4;4;1;1;1;2;2;2;3;3;3;4;4;4;1;1;1;2;2;2;3;3;3;4;4;4]. Thank you for your help in advance.
Adroit

Best Answer

You don't need to reinvent the wheel using slow and inefficient nested loops, just use repmat:
>> A = [1,2,3,4];
>> B = repmat(A(:),4,1)
B =
   1
   2
   3
   4
   1
   2
   3
   4
   1
   2
   3
   4
   1
   2
   3
   4
>> BB = repmat({A},4,4);
If a cell contains an array with more than one element, then it shows a summary of that array:
>> X = {5}
X = 
    [5]
>> X = {5:6}
X = 
    [1x2 double]
but the data is still all there!:
>> X{1}
ans =    5     6
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