
Check whether a list of character vectors contains valid conditions
Source:R/is_condition.R
is_condition.Rd
A valid condition is a character vector of predicate names, where each
predicate corresponds to a column name in a given data frame or matrix.
This function verifies that each element of a list x
contains only valid
predicates that match column names of data
.
Value
A logical vector with one element for each condition in x
. An
element is TRUE
if the corresponding condition is valid, i.e. all of its
predicates are column names of data
. Otherwise, it is FALSE
.
Details
Special cases:
An empty character vector (
character(0)
) is considered a valid condition and always passes the check.A
NULL
element is treated the same as an empty character vector, i.e., it is also a valid condition.
Examples
d <- data.frame(foo = 1:5, bar = 1:5, blah = 1:5)
is_condition(list("foo"), d)
#> [1] TRUE
is_condition(list(c("bar", "blah"), NULL, c("foo", "bzz")), d)
#> [1] TRUE TRUE FALSE