[R] plotting image/contour on irregular grid

[Roger Bivand]

On Fri, 6 May 2005, m p wrote:

> Hello,
> I'd like to make a z(x,y) plot for irregularly spaced
> x,y. What are routines are available in R for this
> purpose? 

One possibility is to interpolate a regular grid using interp() in the 
akima package, then use image() or contour(). Another is to use 
levelplot() with formula z ~ x + y in the lattice package, and the 
equivalent contourplot(); here, the x,y pairs must lie on a grid, but do 
not need to fill the grid (so are regularly spaced with missing grid 
cells).

> Thanks,
> Mark
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no