Shannon entropy of a string

Calculates the Shannon entropy (in bits) of a character string based on character frequency.

Usage

shannon_entropy(s)

Arguments

s

Character(1). The string to measure.

Value

Numeric(1). The Shannon entropy in bits. Returns 0 for empty strings or single-character strings.

See also

is_high_entropy(), guard_output_entropy()

Examples

shannon_entropy("aaaaaa")    # low entropy (0)
#> [1] 0
shannon_entropy("abcdefgh")  # higher entropy
#> [1] 3
shannon_entropy("aB3$xK9!")  # high entropy
#> [1] 3