At least one argument consisting of a points data set must be specified.
cpch
A vector of characters for plotting symbols
add
if add is TRUE then overlay on an existing plot
type
plot data as points if type="p", lines if type="l"
Details
mpoint enables several point or polygon datasets to be overlayed. The plot
region is calculated so that all the specified datasets fit in the region.
The parameter cpch specifies the characters to use for each set of points. The
default cpch consists of the numbers 1 to 9 followed by the uppercase
letters A to Z. If cpch is shorter than the number of point sets to
plot, then it is repeated.
References
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis
code in S-Plus. Computers and Geosciences, 19, 627-655;
the original sources can be accessed at:
http://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and
Gebhardt, A. 2000 Implementing functions for spatial statistical analysis
using the R language. Journal of Geographical Systems, 2, 307-317.