

   PPlloott PPooiinntt OObbjjeeccttss

        plot(point.obj, v, legend.pos=0...)

   AArrgguummeennttss::

   point.obj: a point object generated by `point()'

          v: an optional variable name, if entered will divide
             the points into quantiles and color using 4 colors

          n: `n'

   legend.pos: position of legend (0 - none, 1 - bottom-left, 2
             -bottom-right, 3 - top-right, 4 - top-left),
             requires Lang(v)

   DDeessccrriippttiioonn::

        Plot the spatial locations in a point object, option
        ally coloring by quantile.

   VVaalluuee::

        NULL

   RReeffeerreenncceess::

        http://www.gis.iastate.edu/SGeoStat/homepage.html

   SSeeee AAllssoo::

        `points'

   EExxaammpplleess::

        plot(maas.pts)
        plot(maas.pts,'zinc')
        plot(maas.pts,'zinc',xlab='easting',ylab='northing',axes=T,legend.pos=4)
        # plot additionally the maas bank:
        data(maas.bank)
        lines(maas.bank)

