sort.data.frame {Deducer} | R Documentation |
Sorts a data frame
## S3 method for class 'data.frame'
sort(x, decreasing, by, ...)
x |
A |
decreasing |
unused |
by |
A character, a one sided formula, or an expression indicating the sorting order |
... |
further arguments |
If by
is a formula, or a character vector coerce-able into a formula,
x
is sorted by each element of the formula, with ties broken by subsequent elements.
Elements preceded by a '-' indicate descending order, otherwise ascending order is used. Parentheses or any formula
operator other than + and - are ignored, so sorting by a*b
will sort based on the product of a and b.
If by
is not a formula, a ~
is appended to the left hand side of the call, and coerced into
a formula.
The decreasing argument is included for generic method consistency, and is not used.
returns x
, sorted.
Ian Fellows adapted from code by Ari Friedman and Kevin Wright
data(mtcars)
#sort by the number of cylenders
sort(mtcars, by= ~cyl)
sort(mtcars, by= cyl) #identical: no need for ~
#sort in descending order
sort(mtcars, by= -cyl)
#break ties with horse power
sort(mtcars,by= cyl +hp )
sort(mtcars,by= cyl -hp )
#randomly permute the data
sort(mtcars,by= rnorm(nrow(mtcars)) )
#reverse order
sort(mtcars,by= nrow(mtcars):1 )
#sort by squared deviation from mean hp
sort(mtcars,by= -(hp-mean(hp))^2 )
sort(mtcars,by= "-(hp-mean(hp))^2" ) #identical