roworder {collapse} | R Documentation |
Fast Reordering of Data Frame Rows
Description
A fast substitute for dplyr::arrange
. It returns a sorted copy of the data frame, unless the data is already sorted in which case no copy is made. In addition, rows can be manually re-ordered. Use data.table::setorder
to sort a data frame without creating a copy.
Usage
roworder(X, ..., na.last = TRUE, verbose = .op[["verbose"]])
roworderv(X, cols = NULL, neworder = NULL, decreasing = FALSE,
na.last = TRUE, pos = "front", verbose = .op[["verbose"]])
Arguments
X |
a data frame or list of equal-length columns. | ||||||||||||||||||||||||||
... |
comma-separated columns of | ||||||||||||||||||||||||||
cols |
select columns to sort by using a function, column names, indices or a logical vector. The default | ||||||||||||||||||||||||||
na.last |
logical. If | ||||||||||||||||||||||||||
decreasing |
logical. Should the sort order be increasing or decreasing? Can also be a vector of length equal to the number of arguments in | ||||||||||||||||||||||||||
neworder |
an ordering vector, can be | ||||||||||||||||||||||||||
pos |
integer or character. Different arrangement options if
| ||||||||||||||||||||||||||
verbose |
logical. |
Value
A copy of X
with rows reordered. If X
is already sorted, X
is simply returned.
Note
If you don't require a copy of the data, use data.table::setorder
(you can also use it in a piped call as it invisibly returns the data).
roworder(v)
has internal facilities to deal with indexed data.
See Also
colorder
, Data Frame Manipulation, Fast Grouping and Ordering, Collapse Overview
Examples
head(roworder(airquality, Month, -Ozone))
head(roworder(airquality, Month, -Ozone, na.last = NA)) # Removes the missing values in Ozone
## Same in standard evaluation
head(roworderv(airquality, c("Month", "Ozone"), decreasing = c(FALSE, TRUE)))
head(roworderv(airquality, c("Month", "Ozone"), decreasing = c(FALSE, TRUE), na.last = NA))
## Custom reordering
head(roworderv(mtcars, neworder = 3:4)) # Bring rows 3 and 4 to the front
head(roworderv(mtcars, neworder = 3:4, pos = "end")) # Bring them to the end
head(roworderv(mtcars, neworder = mtcars$vs == 1)) # Bring rows with vs == 1 to the top