checkFormula: Check if an argument is a formula

In checkmate: Fast and Versatile Argument Checks

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))

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.

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.

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)

checkmate documentation built on Aug. 18, 2025, 5:36 p.m.