Check if an argument is a formula
Check if an argument is a formula
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))
x |
[any] |
null.ok |
[ |
.var.name |
[ |
add |
[ |
info |
[character(1)] |
label |
[ |
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 returns a string with the error message.
The function expect_formula always returns an
expectation.
Other basetypes:
checkArray(),
checkAtomicVector(),
checkAtomic(),
checkCharacter(),
checkComplex(),
checkDataFrame(),
checkDate(),
checkDouble(),
checkEnvironment(),
checkFactor(),
checkFunction(),
checkIntegerish(),
checkInteger(),
checkList(),
checkLogical(),
checkMatrix(),
checkNull(),
checkNumeric(),
checkPOSIXct(),
checkRaw(),
checkVector()
f = Species ~ Sepal.Length + Sepal.Width checkFormula(f)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.