'Resize matrix in Julia

How do I convert a matrix A

   A = [a b c 
        d e f 
        g h i]

To matrix B?

   B = [a a b b c c
        a a b b c c
        d d e e f f
        d d e e f f
        g g h h i i
        g g h h i i]
matrixjulia


Solution 1:[1]

It's slightly slower than repeat, but for a numeric array, you can also use kron:

julia> A = permutedims(reshape(1:9, 3, 3))
3×3 Matrix{Int64}:
 1  2  3
 4  5  6
 7  8  9

julia> kron(A, ones(Int, 2, 2))
6×6 Matrix{Int64}:
 1  1  2  2  3  3
 1  1  2  2  3  3
 4  4  5  5  6  6
 4  4  5  5  6  6
 7  7  8  8  9  9
 7  7  8  8  9  9

Sources

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Source: Stack Overflow

Solution Source
Solution 1 sethaxen

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