Method fuzzyEquals

output/java_guava/1.4.18/DoubleMath.java:355–361

Returns true if a and b are within tolerance of each other. Technically speaking, this is equivalent to Math.abs(a - b) <= tolerance || Double.valueOf(a).equals(Double.valueOf(b)). Notable special cases include: All NaNs are fuzzily equal. <li

(double a, double b, double tolerance)

   */

  public static boolean fuzzyEquals(double a, double b, double tolerance) {
    MathPreconditions.checkNonNegative("tolerance", tolerance);
    return Math.copySign(a - b, 1.0) <= tolerance
        // copySign(x, 1.0) is a branch-free version of abs(x), but with different NaN semantics
    || (a == b) // needed to ensure that infinities equal themselves
    || (Double.isNaN(a) && Double.isNaN(b));
  }

  /**
   * Compares {@code a} and {@code b} "fuzzily," with a tolerance for nearly-equal values.