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## REPLICATE

version 1.2 (1.76 KB) by

Create a larger array by expanding each element of an array into a subarray.

Updated

REPLICATE is a companion to REPMAT, but instead of tiling a larger array with the input array, REPLICATE does the equivalent of calling REPMAT on each individual element and then tile the results together. It is faster than looping over each element. It supports 2D and 3D arrays.

Russell

### Russell (view profile)

I used replicate.m to generate some padding on a string cell array.

AA = {'blank'};
myLabels = {'fish','beer'};
myLabels = [ myLabels (replicate (AA,1,3)) ]
myLabels =
'fish' 'beer' 'blank' 'blank' 'blank'

Mark Ruzon

### Mark Ruzon (view profile)

This is a more elegant and faster solution for the 2D case. The next version of the file will have this solution. Unfortunately, KRON gives 2D results when Y is 3D, so a different approach is needed in the 3D case.
A = reshape(1:6,[1 3 2]);
S = [2 2 2];
A(kron(reshape(1:numel(A),size(A)),ones(S)))
replicate(A,S)

Jos (10584)

### Jos (10584) (view profile)

Indexing with KRON is equally flexible:
% data
A = {12 {'yy' 'xxx'} ; 'aaa' rand(2)}
nr = 3 ;
nc = 5 ;
% engine
B = A(kron(reshape(1:numel(A),size(A)),ones([nr nc])))

Mark Ruzon

### Mark Ruzon (view profile)

KRON works for floats and doubles but not integral types, structs, or cell arrays. KRON relies on multiplication, while REPLICATE uses only indexing, thus making it more flexible.

Jos (10584)

### Jos (10584) (view profile)

Nice try, but KRON can handle the job perfectly, for instance, kron(A,ones([2, 3]))