Re: [R] contour plot, failing to interpolate through all data

From: Dieter Menne <dieter.menne_at_menne-biomed.de>
Date: Wed, 05 Nov 2008 07:44:27 +0000 (UTC)

Folkes, Michael <Michael.Folkes <at> dfo-mpo.gc.ca> writes:

> I'm having trouble making contour lines for this attached, sparse
> dataset (low data:NA ratio!). Is it the high number of NA's, or funny
> layout of the densities, or something else that's causing this?
>
> ####start data to be in file='testmatrix.csv'
>
> "0.5","1","1.5","2","2.5","3"
> "-0.833",NA,NA,NA,NA,NA,21.05
> "-0.8",NA,NA,NA,NA,10.62,NA
> "-0.75",NA,NA,NA,5.13,NA,NA
> "-0.667",NA,NA,2.24,NA,NA,11.68

contour needs a more data, it's rather a plotting workhorse and not so good for interpolation.
There are examples for spatial statistics in library/MASS/scripts/ch15.R and in "the book" by Venables/Ripley. You might also search for "geo" in the packages, because your problem is fairly common in geographical ecology.

Dieter



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