sort.data.frame {Deducer} R Documentation

## Sort Data

### Description

Sorts a data frame

### Usage

```## S3 method for class 'data.frame'
sort(x, decreasing, by, ...)
```

### Arguments

 `x` A `data.frame` to be sorted `decreasing` unused `by` A character, a one sided formula, or an expression indicating the sorting order `...` further arguments

### Details

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.

### Value

returns `x`, sorted.

### Author(s)

Ian Fellows adapted from code by Ari Friedman and Kevin Wright

`sort` `order`

### Examples

```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
```

[Package Deducer version 0.7-9 Index]