repmat() of matlab

repmat - Replicate and tile array

Syntax

B = repmat(A,m,n)
B = repmat(A,[m n])
B = repmat(A,[m n p...])

Description

B = repmat(A,m,n) creates a large matrix B consisting of an m-by-n tiling of copies of A. The size of B is [size(A,1)*m, (size(A,2)*n]. The statement repmat(A,n) creates an n-by-n tiling.

B = repmat(A,[m n]) accomplishes the same result as repmat(A,m,n).

B = repmat(A,[m n p...]) produces a multidimensional array B composed of copies of A. The size of B is [size(A,1)*m, size(A,2)*n, size(A,3)*p, ...].

Remarks

repmat(A,m,n), when A is a scalar, produces an m-by-n matrix filled with A's value and having A's class. For certain values, you can achieve the same results using other functions, as shown by the following examples:

• repmat(NaN,m,n) returns the same result as NaN(m,n).

• repmat(single(inf),m,n) is the same as inf(m,n,'single').

• repmat(int8(0),m,n) is the same as zeros(m,n,'int8').

• repmat(uint32(1),m,n) is the same as ones(m,n,'uint32').

• repmat(eps,m,n) is the same as eps(ones(m,n)).

Examples

In this example, repmat replicates 12 copies of the second-order identity matrix, resulting in a "checkerboard" pattern.

B = repmat(eye(2),3,4)&eye() creats an identity matrix  B =      

1     0     1     0     1     0     1     0      0     1     0     1     0     1     0     1      1     0     1     0     1     0     1     0      0     1     0     1     0     1     0     1      1     0     1     0     1     0     1     0      0     1     0     1     0     1     0     1 

The statement N = repmat(NaN,[2 3]) creates a 2-by-3 matrix of NaNs.

NOTE: Obtain from Matlab official website