static double weightedAverage(double x1, double w1, double x2, double w2) {
        if (x1 <= x2) {
            return weightedAverageSorted(x1, w1, x2, w2);
        } else {
            return weightedAverageSorted(x2, w2, x1, w1);
        }
    }
static double weightedAverage ( double x1 , double w1 , double x2 , double w2 ) { if ( x1 <= x2 ) { return weightedAverageSorted ( x1 , w1 , x2 , w2 ) ; } else { return weightedAverageSorted ( x2 , w2 , x1 , w1 ) ; } }
Same as {@link #weightedAverageSorted(double, double, double, double)} but flips
the order of the variables if <code>x2</code> is greater than
<code>x1</code>.