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top_n: Select top (or bottom) n rows (by value)In dplyr: A Grammar of Data Manipulation

Description Usage Arguments Examples

View source: R/top-n.R

Description

top_n() has been superseded in favour of slice_min()/slice_max(). While it will not be deprecated in the near future, retirement means that we will only perform critical bug fixes, so we recommend moving to the newer alternatives.

top_n() was superseded because the name was fundamentally confusing as it returned what you might reasonably consider to be the bottom rows. Additionally, the wt variable had a confusing name, and strange default (the last column in the data frame). Unfortunately we could not see an easy way to fix the existing top_n() function without breaking existing code, so we created a new alternative.

Usage

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top_n(x, n, wt) top_frac(x, n, wt)

Arguments

x	A data frame.
n	Number of rows to return for top_n(), fraction of rows to return for top_frac(). If n is positive, selects the top rows. If negative, selects the bottom rows. If x is grouped, this is the number (or fraction) of rows per group. Will include more rows if there are ties.
wt	(Optional). The variable to use for ordering. If not specified, defaults to the last variable in the tbl.

Examples

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df <- data.frame(x = c(6, 4, 1, 10, 3, 1, 1)) df %>% top_n(2) # highest values df %>% top_n(-2) # lowest values # now use df %>% slice_max(x, n = 2) df %>% slice_min(x, n = 2) # top_frac() -> prop argument of slice_min()/slice_max() df %>% top_frac(.5) # -> df %>% slice_max(x, prop = 0.5)

Example output

Attaching package: dplyr The following objects are masked from package:stats: filter, lag The following objects are masked from package:base: intersect, setdiff, setequal, union Selecting by x x 1 6 2 10 Selecting by x x 1 1 2 1 3 1 x 1 10 2 6 x 1 1 2 1 3 1 Selecting by x x 1 6 2 4 3 10 x 1 10 2 6 3 4

dplyr documentation built on Feb. 8, 2022, 5:15 p.m.

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