Ordering (sorting) rows of a data frame by the certain variables in the
data frame. This function is essentially a wrapper for the order()
function - the important difference being that variables to order by
can be given by a model formula.
Usage
orderBy(formula, data)
Arguments
formula
The right hand side of a formula
data
A data frame
Value
The ordered data frame
Details
The sign of the terms in the formula determines whether sorting should
be ascending or decreasing; see examples below