CODEWITHSUNDEEP
rvectorization
Deyber Arley Valencia
Deyber Arley Valencia

Reputation: 45

replicate by columns, but transposing in r with vectorization

I have a matrix like this:

m1 <- matrix(c(1,2,3,4,5,6,7,8,9), nrow = 3, byrow = TRUE)

and I would like to have every column repeated "m" times, but transposing into files and concat the results horizontally. I mean, suppose "m" is 3, I would like to have something like this:

matrix(c(1,4,7,2,5,8,3,6,9,1,4,7,2,5,8,3,6,9,1,4,7,2,5,8,3,6,9), 
                     nrow = 3, byrow = TRUE)

Is there any vectorized way to do this?

I have tried using rep to replicate the columns and then transposing, but I end with many rows

Upvotes: 3

Views: 162

Answers (1)

akrun
akrun

Reputation: 887431

We can use rep

matrix(rep(m1, each=nrow(m1)), nrow=3)

Or

`dim<-`(rep(m1, each=nrow(m1)), dim(m1)*c(1,3))

Or

t(replicate(nrow(m1), c(m1)))

data

m1 <- matrix(c(1,2,3,4,5,6,7,8,9), nrow = 3, byrow = TRUE)

Upvotes: 2

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