CODEWITHSUNDEEP
rmatrix
ulrich
ulrich

Reputation: 3587

concatenating matrix in R

I have a list of matrices. How would I append these matrices to get a single matrix?

Sample:

> matrix(1, nrow=2, ncol=3)
     [,1] [,2] [,3]
 [1,]    1    1    1
 [2,]    1    1    1
> matrix(2, nrow=3, ncol=2)
     [,1] [,2] 
[1,]    2    2 
[2,]    2    2 
[3,]    2    2 
> m1 <- matrix(1, nrow=2, ncol=3)
> m2 <- matrix(2, nrow=3, ncol=2)

Now we can have many matrices in a list, let's say we have only two:

l <- list(m1, m2)

I would like to achieve something like:

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

Upvotes: 1

Views: 75

Answers (1)

akrun
akrun

Reputation: 887153

You can try bdiag

library(Matrix)
bdiag(l)
#5 x 5 sparse Matrix of class "dgCMatrix"
#          
#[1,] 1 1 1 . .
#[2,] 1 1 1 . .
#[3,] . . . 2 2
#[4,] . . . 2 2
#[5,] . . . 2 2

 as.matrix(bdiag(l)) #will convert to `matrix` with `0` replacing the `.`

Upvotes: 5

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