[pstricks] stem plots (Matlab-style)

[hdiazmo at unal.edu.co]

Has anyone developed a way to generate a Matlab-style stem plot from a file of data in PSTricks? (A stem plot is a "a plot that displays as lines extending from a baseline along the x axis. The length of the lines gives the value of the function. A marker, usually a circle, indicates the point")

I would appreciate any help,
Hernando Diaz, National University of Colombia, Bogota.