scalar {assertthat} | R Documentation |
Assert input is a scalar.
Description
is.scalar
provides a generic method for checking input is a scalar.
is.string
, is.flag
, is.number
and is.count
provide tests for specific types.
Usage
is.scalar(x)
is.string(x)
is.number(x)
is.flag(x)
is.count(x)
Arguments
x |
object to test |
See Also
Other assertions: are_equal
,
is.error
, noNA
,
not_empty
Examples
# Generic check for scalars
see_if(is.scalar("a"))
see_if(is.scalar(1:10))
# string = scalar character vector
see_if(is.string(1:3))
see_if(is.string(c("a", "b")))
see_if(is.string("x"))
# number = scalar numeric/integer vector
see_if(is.number(1:3))
see_if(is.number(1.5))
# flag = scalar logical vector
see_if(is.flag(1:3))
see_if(is.flag("a"))
see_if(is.flag(c(FALSE, FALSE, TRUE)))
see_if(is.flag(FALSE))
# count = scalar positive integer
see_if(is.count("a"))
see_if(is.count(-1))
see_if(is.count(1:5))
see_if(is.count(1.5))
see_if(is.count(1))
[Package assertthat version 0.2.1 Index]