Re: [R] Contour Plots

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Thu 23 Jun 2005 - 00:57:53 EST

Bernard L. Dillard wrote:

> Hello all.
>
> I'm confused a bit about contour plots. After reading the help at
> "?contour", it seems as though the contour plot is for 3D plots (x,y, and
> z). My data is in the form of grid coordinates (x,y), and I want to see a
> contour plot of the data so that I can tell where most observations lie.
> My question is simple but still evasive.
>
> Say my data is called places. One column is X and another is Y. Or,
>
> places$X places$Y
>
> Coordinate 1 32 50
> Coordinate 2 15 33
> Coordinate 3 28 20
> etc
>
> How do I get R to do the contour plot with no third "z" coordinate?

For just 2 columns, a contour plot does not make much sense, I guess. I think an image() makes much more sense in this case.

Your z matrix consists of the entries of the data.frame/matrix given above, the x and y vectors are the column and row numbers.

Uwe Ligges

> Thanks.
>



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