Merging two matrices in a specific sequence

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I have a matrix A of order 150*24 and a second matrix B of order 50*24. I want to merge the matrix B in matrix A in such a way that row of matrix B are

[1,2,3,4,5,...,50]

merge in A in such a manner that the position of the rows of matrix B in matrix A become

[5,6,12,13,19,20,26,27,33,34,40,41,47,48,54,55,61,62,68,69,75,76,82,83,...]

so the matrix A become of order 200*24, how could I do this in R?

sequence r matrix
1 Answers

Create the index vector and a zero matrix with the desired dimensions, then fill the matrix, like so:

i <- 5:6 + rep(7L * 0:(nrow(B)/2-1), each = 2L)
R <- matrix(0, nrow(A) + nrow(B), ncol(A))
R[i, ] <- B
R[-i, ] <- A
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