Sort matrix according to first column in R

Question

I have a matrix with two columns of the following form:

1 349
1 393
1 392
4 459
3 49
3 32
2 94

I would like to sort this matrix in increasi

Answer 1

The accepted answer works like a charm unless you're applying it to a vector. Since a vector is non-recursive, you'll get an error like this

$ operator is invalid for atomic vectors

You can use [ in that case

foo[order(foo["V1"]),]