How do I double the size of a given matrix?

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Steven Gangano 2022-4-8

评论： Steven Gangano 2022-4-8

A = [ 1 2

3 4

]

I want to double the size of matrix A by adding a duplicate of row 1 underneath it.

And also adding a duplicate of row 2 underneath it.

This is a simple example, but I will be doing this for a much larger matrix of 300x500. What is the best way to tackle this?

B = [ 1 2

1 2

3 4

]

KSSV 2022-4-8

编辑：KSSV 2022-4-8

A = [   1 2 
          3 4] ;
iwant =  repelem(A,2,1)
iwant = 4×2
     1     2
     1     2
     3     4
     3     4

KSSV 2022-4-8

[m, n] = size(A) ; B = zeros(2*m, n) ; B(1:m,:) = A(1,:) ; B(m+1:end, :) = A(2, :) ;

Steven Gangano 2022-4-8

Thank you!

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