either a matrix or data.frame with two columns, a list
with components x and y, or an object of any class that can be
used for maps and provides its own plot method (e.g.,
"SpatialPolygons" from package sp). A list of the previously
mentioned types can also be provided.
add
a logical indicating whether map should be added to an
already existing plot (the default is FALSE).
...
further arguments and graphical parameters to be passed to
plot and/or graphics::lines().
Author
Andreas Alfons
References
M. Templ, A. Alfons, P. Filzmoser (2012) Exploring incomplete
data using visualization tools. Journal of Advances in Data Analysis
and Classification, Online first. DOI: 10.1007/s11634-011-0102-y.