Review

class ArrayFieldVector {
    /** Find the orthogonal projection of this vector onto another vector.
     * @param v vector onto which {@code this} must be projected
     * @return projection of {@code this} onto {@code v}
     * @throws DimensionMismatchException if {@code v} is not the same size as
     * {@code this}
     * @throws MathArithmeticException if {@code v} is the null vector.
     */
    public ArrayFieldVector<T> projection(ArrayFieldVector<T> v)
        throws DimensionMismatchException, MathArithmeticException {
        return (ArrayFieldVector<T>) v.mapMultiply(dotProduct(v).divide(v.dotProduct(v)));
    }

}