Hi,
following Tanimura et al. 2006 (Proportional Symbol Mapping in R) [1],
I'm trying to implement the ProportionalSymbolMap function for maps of
class "map" (produced by the maps package), instead of maps of class
"Map" (imported from a GIS polygon vector file). That function uses
the Map2points() function to (as far as I could understand) extract
the points (i.e. map boundaries) from a "Map" object to a n x 2
matrix, as in
> verts <- Map2points(map)[order(variable, decreasing = T),]
What I tried to do to substitute this function was
> verts <- matrix(c(map$x,map$y),ncol=2)[order(variable,
decreasing = T),]
where map is an object of class "map". But, that doesn't work. As I
have no experience with shapefiles, I'm restricted to know what
exactly Map2points() does and if there is some other function that can
do the same thing for a "map" object.
BTW, if trying to implement this function (ProportionalSymbolMap) for
a "map" object (instead of a "Map") is not a good idea (because all
the rest of the function), please let me know. I think (on my limited
knowledge on this) that with same adjustments it may be possible.
[1] http://www.jstatsoft.org/v15/i05/v15i05.pdf
Thanks for any hint,
--
Fernando Mayer
Grupo de Estudos Pesqueiros - GEP
Centro de Ciências Tecnológicas, da Terra e do Mar - CTTMar
Universidade do Vale do Itajaí - UNIVALI
Itajaí - SC - Brasil
e-mail: fernandomayer [EMAIL PROTECTED] gmail.com
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