Description Usage Arguments Value See Also Examples
Checks to see if the input is a formula.
1 2 3 4 5 6 7 8 9 10 11 12 13 | assert_is_formula(x, severity = getOption("assertive.severity", "stop"))
assert_is_one_sided_formula(x, severity = getOption("assertive.severity",
"stop"))
assert_is_two_sided_formula(x, severity = getOption("assertive.severity",
"stop"))
is_formula(x, .xname = get_name_in_parent(x))
is_one_sided_formula(x, .xname = get_name_in_parent(x))
is_two_sided_formula(x, .xname = get_name_in_parent(x))
|
x |
Input to check. |
severity |
How severe should the consequences of the assertion be?
Either |
.xname |
Not intended to be used directly. |
The is_*
functions return TRUE
when the input is a
formula. The assert_*
functions return nothing but throw an error
if the corresponding is_*
function returns FALSE
.
is_environment
and is_language
1 2 | is_one_sided_formula(~ x)
is_two_sided_formula(y ~ x)
|
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