  Some difficulties, both numerical and conceptual, of the method to compute
one dimensional wave functions by numerically integrating the quantum
Hamilton-Jacobi equation, presented in the paper mentioned in the title, are
analyzed. The origin of these difficulties is discussed, and it is shown how
they can be avoided by means of another approach, based on different solutions
of the same equation. Results for the same potentials, obtained by this latter
method are presented and a comparison is made.
