scalb (clj)

function

(scalb d scaleFactor)

Returns d * 2^scaleFactor, scaling by a factor of 2. If the exponent is between Double/MIN_EXPONENT and Double/MAX_EXPONENT, the answer is exact. If d is ##NaN => ##NaN If d is ##Inf or ##-Inf => ##Inf or ##-Inf respectively If d is zero => zero of same sign as d See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#nextDown-double-

Examples

clojure

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

(deftest test-scalb
  (is (NaN? (m/scalb ##NaN 1)))
  (is (= ##Inf (m/scalb ##Inf 1)))
  (is (= ##-Inf (m/scalb ##-Inf 1)))
  (is (pos-zero? (m/scalb 0.0 2)))
  (is (neg-zero? (m/scalb -0.0 2)))
  (is (= 32.0 (m/scalb 2.0 4))))