orderBy {doBy} | R Documentation |
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.
orderBy(formula, data)
formula |
The right hand side of a formula |
data |
A data frame |
The sign of the terms in the formula determines whether sorting should be ascending or decreasing; see examples below
The ordered data frame
Søren Højsgaard, sorenh at mail dot dk and Kevin Wright
summaryBy
,
transformBy
,
splitBy
,
lapplyBy
,
data(dietox) orderBy(~Time+Evit, data=dietox) ## Sort decreasingly by Time orderBy(~-Time+Evit, data=dietox)