R help - Aug 2003 - Contour plot for arbitrary (x,y,z)

Hello.

Is there an easy-to-use contour plot function analogous to scatterplot3d 
that can draw handle a dataset of arbitrary (x,y,z) triplets? That is, 
say x, y, and z are each measured quanties, and exhibit neither order 
nor regularity.

I looked at the lattice package function "contourplot" but it seems 
complicated, and it's not clear from the documentation whether it can 
handle arbitrary (x,y) values. I'm looking for something like the base 
package "contour" function that does not make any assumptions about
(x,y,z).

Thanks,

Ronnen.

Hi

On 13 Aug 2003 at 12:25, Ronnen Levinson wrote:
> Hello.
> 
> Is there an easy-to-use contour plot function analogous to
> scatterplot3d that can draw handle a dataset of arbitrary (x,y,z)
> triplets? That is, say x, y, and z are each measured quanties, and
> exhibit neither order nor regularity.
maybe

library(akima)
#provided you do not have missing data

contour(interp(x,y,z))

if some of your data are missing, you have to filter it out e.g. by
complete.cases()
> 
> I looked at the lattice package function "contourplot" but it
seems
> complicated, and it's not clear from the documentation whether it can
> handle arbitrary (x,y) values. I'm looking for something like the base
> package "contour" function that does not make any assumptions
about
> (x,y,z).
> 
> Thanks,
> 
> Ronnen.
> 
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CheersPetr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz