Method log2

output/java_guava/1.4.19/DoubleMath.java:215–217

Returns the base 2 logarithm of a double value. Special cases: If x is NaN or less than zero, the result is NaN. If x is positive infinity, the result is positive infinity. If x is positive or negative zero, the result is negative infinity. The

(double x)

  public static double log2(double x) {
    return log(x) / LN_2; // surprisingly within 1 ulp according to tests
  }

  private static final double LN_2 = log(2);