cdm/src/main/java/ucar/nc2/util/Misc.java
public static float absoluteDifference(float a, float b) {
    if (Float.compare(a, b) == 0) {  // Shortcut: handles infinities and NaNs.
      return 0;
    } else {
      return Math.abs(a - b);
    }
  }
public static float absoluteDifference(float a, float b) {
    if (Float.compare(a, b) == 0) {  // Shortcut: handles infinities and NaNs.
      return 0;
    } else {
      return Math.abs(a - b);
    }
  }
Returns the absolute difference between two numbers, i.e. {@code |a - b|}.

@param a  first number.
@param b  second number.
@return   the absolute difference.