2.6) Useful Functions for Vectors

Try out the functions listed below on individual columns of the data frame GRASS.

`sort()`	sorts a vector into ascending order.
`rev()`	reverses the order of a vector.
`unique()`	gives the unique elements of a vector.
`rank()`	gives the ranks of the values in a vector.
`cbind()`	binds vectors together as columns of a matrix, so long as the vectors are of the same mode and equal length. Similarly,
`rbind()`	binds vectors as rows of a matrix.
`which()`	tells you which element/s of a logical vector are `TRUE`. You can put a logical test in the brackets in order to locate values that meet a criterion – e.g. `which(y > 1.96)`.

We'll look at that last function in more detail on the next page...