Hi Rosario,
you might have a look at the "maps" and "maptools" (for reading
shape-files) packages.
#e.g.
library(maps)
map("world",c("sweden","germany"))
Cheers
Am 04.08.2011 02:58, schrieb Rosario Garcia Gil:
> Hello
>
> I am trying to draw a basic black and white map of two European countries.
>
> After searching some key words in google and reading many pages I arrived to
> the conclusion that persp() could be used to draw that map.
>
> I have prepared three small example files, which are supposed to be the files
> required for running that function.
>
> xvector is a vector with the longitudes
> yvector is a vector with the latitudes
> zmatrix is supposed to the height, but since I only need a flat map I just
> gave the value 1 to each of the entries of the matrix (I am not sure this is
> correct though).
>
> The first question for me when using persp() is that x and y values should be
> in increasing values (following the instructions), but I understand that the
> coordinates x and y are actually pairs of values (longitude/latitude pairs of
> values) and if I order them in ascending order both then the pairing is gone.
> I guess I am totally lost!
>
> Still even if I try to run persp() by ordering in ascending value x and y
> values (even if it does not make sense for me) I still get this message:
>
> <- persp(xvector,yvector,zmatrix,theta=-40,phi=30)
> Error in persp.default(xvector, yvector, zmatrix, theta = -40, phi = 30) :
> increasing 'x' and 'y' values expected
>
> Any help is wellcome. Is there any other better function to draw a flat map
> (2D), also example of the imput files is wellcome. Thanks in advance.
> Rosario
>
>
>
>
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--
Eik Vettorazzi
Department of Medical Biometry and Epidemiology
University Medical Center Hamburg-Eppendorf
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20246 Hamburg
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