unite
Unite multiple columns into one.
Convenience function to paste together multiple columns into one.
Usage
unite(data, col, ..., sep = "_", remove = TRUE)Arguments
- data
A data frame.
- col
The name of the new column, as a string or symbol.
This argument is passed by expression and supports quasiquotation (you can unquote strings and symbols). The name is captured from the expression with
rlang::ensym()(note that this kind of interface where symbols do not represent actual objects is now discouraged in the tidyverse; we support it here for backward compatibility).- ...
A selection of columns. If empty, all variables are selected. You can supply bare variable names, select all variables between x and z with
x:z, exclude y with-y. For more options, see thedplyr::select()documentation. See also the section on selection rules below.- sep
Separator to use between values.
- remove
If
TRUE, remove input columns from output data frame.
Rules for selection
Arguments for selecting columns are passed to
tidyselect::vars_select() and are treated specially. Unlike other
verbs, selecting functions make a strict distinction between data
expressions and context expressions.
A data expression is either a bare name like
xor an expression likex:yorc(x, y). In a data expression, you can only refer to columns from the data frame.Everything else is a context expression in which you can only refer to objects that you have defined with
<-.
For instance, col1:col3 is a data expression that refers to data
columns, while seq(start, end) is a context expression that
refers to objects from the contexts.
If you really need to refer to contextual objects from a data
expression, you can unquote them with the tidy eval operator
!!. This operator evaluates its argument in the context and
inlines the result in the surrounding function call. For instance,
c(x, !! x) selects the x column within the data frame and the
column referred to by the object x defined in the context (which
can contain either a column name as string or a column position).
See Also
separate(), the complement.
Examples
# NOT RUN {
library(dplyr)
unite_(mtcars, "vs_am", c("vs","am"))
# Separate is the complement of unite
mtcars %>%
unite("vs_am", vs, am) %>%
separate(vs_am, c("vs", "am"))
# }