checkmate (version 2.3.2)

checkFormula: Check if an argument is a formula

Description

Check if an argument is a formula

Usage

checkFormula(x, null.ok = FALSE)
check_formula(x, null.ok = FALSE)
assertFormula(x, null.ok = FALSE, .var.name = vname(x), add = NULL)
assert_formula(x, null.ok = FALSE, .var.name = vname(x), add = NULL)
testFormula(x, null.ok = FALSE)
test_formula(x, null.ok = FALSE)
expect_formula(x, null.ok = FALSE, info = NULL, label = vname(x))

Value

Depending on the function prefix: If the check is successful, the functions

assertFormula/assert_formula return

x invisibly, whereas

checkFormula/check_formula and

testFormula/test_formula return

TRUE. If the check is not successful,

assertFormula/assert_formula

throws an error message,

testFormula/test_formula

returns FALSE, and checkFormula/check_formula

return a string with the error message. The function expect_formula always returns an

expectation.

Arguments

x

[any]
Object to check.

null.ok

[logical(1)]
If set to TRUE, x may also be NULL. In this case only a type check of x is performed, all additional checks are disabled.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

See Also

Other basetypes: checkArray(), checkAtomic(), checkAtomicVector(), checkCharacter(), checkComplex(), checkDataFrame(), checkDate(), checkDouble(), checkEnvironment(), checkFactor(), checkFunction(), checkInteger(), checkIntegerish(), checkList(), checkLogical(), checkMatrix(), checkNull(), checkNumeric(), checkPOSIXct(), checkRaw(), checkVector()

Examples

f = Species ~ Sepal.Length + Sepal.Width
checkFormula(f)