checkScalar: Check if an argument is a single atomic value
Description
Check if an argument is a single atomic value
Usage
checkScalar(x, na.ok = FALSE)
assertScalar(x, na.ok = FALSE, .var.name)
testScalar(x, na.ok = FALSE)
Arguments
x
[ANY]
Object to check.
.var.name
[character(1)]
Name for x. Defaults to a heuristic to determine
the name using deparse and substitute.
na.ok
[logical(1)]
Are missing values allowed? Default is FALSE.
Value
Depending on the function prefix:
If the check is successful, all functions return TRUE.
If the check is not successful, assertScalar throws an error message,
testScalar returns FALSE and checkScalar returns
a string with the error message.
Details
This function does not distinguish between
NA, NA_integer_, NA_real_, NA_complex_NA_character_ and NaN.