log1p (clj)

function

(log1p x)

Returns ln(1+x). For small values of x, log1p(x) is more accurate than log(1.0+x). If x is ##NaN or < -1 => ##NaN If x is ##Inf => ##Inf If x is -1 => ##-Inf If x is 0 => 0 with sign matching x See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#log1p-double-

Examples

clojure

(ns clojure.test-clojure.math
  (:require
    [clojure.test :refer :all]
    [clojure.math :as m]))

(deftest test-log1p
  (is (NaN? (m/log1p ##NaN)))
  (is (= ##Inf (m/log1p ##Inf)))
  (is (= ##-Inf (m/log1p -1.0)))
  (is (pos-zero? (m/log1p 0.0)))
  (is (neg-zero? (m/log1p -0.0))))