memisc (version 0.99.31.7)

sort-methods: Convenience Methods to Sort Data Frames and Data Sets

Description

The methods below return a sorted version of the data frame or data set, given as first argument.

Usage

# S3 method for data.frame
sort(x,decreasing=FALSE,by=NULL,na.last=NA,...)
# S3 method for data.set
sort(x,decreasing=FALSE,by=NULL,na.last=NA,...)

Value

A sorted copy of x.

Arguments

x

a data frame or data set.

decreasing

a logical value, should sorting be in increasing or decreasing order?

by

a character name of variable names, by which to sort; a formula giving the variables, by which to sort; NULL, in which case, the data frame / data set is sorted by all of its variables.

na.last

for controlling the treatment of 'NA's. If 'TRUE', missing values in the data are put last; if 'FALSE', they are put first; if 'NA', they are removed

...

other arguments, currently ignored.

Examples

DF <- data.frame(
        a = sample(1:2,size=20,replace=TRUE),
        b = sample(1:4,size=20,replace=TRUE))
sort(DF)
sort(DF,by=~a+b)
sort(DF,by=~b+a)
sort(DF,by=c("b","a"))
sort(DF,by=c("a","b"))