Print a matrix without row and column indices

Question

If I print a matrix, it is shown with row and column indices in the console. E.g.

> print(diag(3))
     [,1] [,2] [,3]
[1,]    1    0    0
[2,]    0    1    0
[3,]    0    0    1

How can I suppress the column and row indices? I.e. something like this:

> print(diag(3), indices=FALSE)
1    0    0
0    1    0
0    0    1

I can see that the cwhmisc package should contain a printM function to do this according to the documentation but it is not there when I load cwhmisc. Also, this seems like something you should be able to to in base R.

Answer 1

The function prmatrix in the base package could work for this, it can take the arguments collab and rowlab:

prmatrix(diag(3), rowlab=rep("",3), collab=rep("",3))

 1 0 0
 0 1 0
 0 0 1

Answer 2

Another solution with function write.table

write.table(diag(3), row.names=F, col.names=F)

You can make it prettier by separating the columns with a tabulation

write.table(matrix(sample(1000,9),3,3), row.names=F, col.names=F, sep="\t")