How to turn a vector into a matrix in R?

Question

I have a vector with 49 numeric values. I want to have a 7x7 numeric matrix instead.

Is there some sort of convenient automatic conversion statement I can use, or d

Answer 1

Just use matrix:

matrix(vec,nrow = 7,ncol = 7)

One advantage of using matrix rather than simply altering the dimension attribute as Gavin points out, is that you can specify whether the matrix is filled by row or column using the byrow argument in matrix.