cdm/src/main/java/ucar/nc2/util/Misc.java
public static double absoluteDifference(double a, double b) {
    if (Double.compare(a, b) == 0) {  // Shortcut: handles infinities and NaNs.
      return 0;
    } else {
      return Math.abs(a - b);
    }
  }
public static double absoluteDifference(double a, double b) {
    if (Double.compare(a, b) == 0) {  // Shortcut: handles infinities and NaNs.
      return 0;
    } else {
      return Math.abs(a - b);
    }
  }
Same as {@link #absoluteDifference(float, float)}, but for doubles.