Description Usage Arguments Details Value Author(s) Examples
It is often flexible to input variables in plotting functions, and this generic function convert most common inputs (character, numeric or formula) to a character vector of variable names.
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vars |
a character vector of variable names, or a numeric vector of
column indices, or a two-sided formula like |
data |
the data containing the variables |
Numeric indices are converted to character names according to the positions
of variables in the data; all.vars
is used to extract all
variable names in a formula, and the special formula ~ .
is treated
differently: it means all variables in the data except thoese names starting
with a dot (e.g. .color
).
A character vector
Yihui Xie <http://yihui.name>
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