Check a Vector For Being Numeric, Zero Or a Whole Number

Test if x contains only integer numbers, or if is numeric or if it is zero.

IsWhole(x, all = FALSE, tol = sqrt(.Machine$double.eps), na.rm = FALSE)
IsZero(x, tol = sqrt(.Machine$double.eps), na.rm = FALSE)
IsNumeric(x, length.arg = Inf, integer.valued = FALSE, positive = FALSE, na.rm = FALSE)

Arguments

x

a (non-empty) numeric vector of data values.

all

logical, specifying if the whole vector should be checked. If set to TRUE the function will return the result of all(IsWhole(x)).

tol

tolerance to be used

length.arg

integer, the length of the vector to be checked for.

integer.valued

logical, should x be checked as integer?

positive

logical, is x supposed to be positive?

na.rm

logical, indicating whether NA values should be stripped before the computation proceeds. Defaults to FALSE.

Details

IsWhole is the suggested solution for checking for an integer value, as is.integer tests for class(x) == "integer" and does NOT test whether x (which might be of class "numeric") contains only integer numbers. (Why not simply implement it in base?)

IsZero tests float numeric values for being zero.

IsNumeric combines a test for numeric and integers.

Value

logical vector of the same dimension as x.

Author

R-Core, Andri Signorell <andri@signorell.net>, Thomas W. Yee

See also

is.integer

Examples

(x <- seq(1,5, by=0.5))
#> [1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
IsWhole( x ) #-->  \code{TRUE} \code{FALSE} \code{TRUE} ...
#> [1]  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE FALSE  TRUE


# ... These are people who live in ignorance of the Floating Point Gods.
# These pagans expect ... (Burns, 2011)" the following to be TRUE:
(.1 - .3 / 3) == 0
#> [1] FALSE

# they might be helped by
IsZero(.1 - .3 / 3)
#> [1] TRUE