Test whether an object contains numeric values from the interval \([0,1]\)

Check if the input consists only of numeric values between 0 and 1, inclusive. This is often useful when validating truth degrees, membership values in fuzzy sets, or probabilities.

Usage

is_degree(x, na_rm = FALSE)

Arguments

x

The object to be tested. Can be a numeric vector, matrix, or array.

na_rm

Logical; whether to ignore NA values. If TRUE, NAs are treated as valid values. If FALSE and x contains any NAs, the function immediately returns FALSE.

Value

A logical scalar. Returns TRUE if all (non-NA) elements of x are numeric and lie within the closed interval \([0,1]\). Returns FALSE if:

• x contains any NA values and na_rm = FALSE

• any element is outside the interval \([0,1]\)

• x is not numeric

• x is empty (length(x) == 0)

See also

is.numeric()

Author

Michal Burda

Examples

is_degree(0.5)
#> [1] TRUE
is_degree(c(0, 0.2, 1))
#> [1] TRUE
is_degree(c(0.5, NA), na_rm = TRUE)   # TRUE
#> [1] TRUE
is_degree(c(0.5, NA), na_rm = FALSE)  # FALSE
#> [1] FALSE
is_degree(c(-0.1, 0.5))               # FALSE
#> [1] FALSE
is_degree(numeric(0))                 # FALSE
#> [1] TRUE