I am trying to use the maptools library to display geographical data. At the moment I have some trouble understanding how the " auxvar " variable is supposed to be used in the plot.Map function.
I am using R Version 1.8.1 (2003-11-21) on Linux
Looking at the plot.Map function itself, I see that it calls a color.ramp function (I am reporting only the relevant part here):
...
if (attr(theMap$Shapes, "shp.type") == "poly") {
if (!is.null(auxvar) && nclass > 1) {
col.rmp <- color.ramp(nclass, nvec = auxvar)
for (i in recs) {
...I don't seem to be able to get any information on this color.ramp function. In fact the function doesn't seem to exist if I search for it with ls()
Does anyone have any insight?
-- Marco Albani, Ph.D. Postdoctoral Fellow Dept. of Organismic and Evolutionary Biology Harvard University HUH 22 Divinity Avenue Cambridge, MA 02138-2094 USA
Tel: +1 617 495 1621 Fax: +1 617 495 9484
http://www.people.fas.harvard.edu/~malbani
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