[R] persp()

[Eik Vettorazzi]

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

Martinistr. 52
20246 Hamburg

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