**From:** Patrick Giraudoux (*patrick.giraudoux@univ-fcomte.fr*)

**Date:** Sun 02 May 2004 - 18:30:39 EST

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Message-id: <001201c4301f$cdacf480$a249fb51@PC728329681112>

Hi,

I am gradually moving from the classical R plot functions to the library Lattice

I have some questions about contourplot () and its arguments:

1/ I am working on geographical coordinates which makes necessary that the X (longitude) and Y (latitude) units be represented with

the same distance on screen. This was obtained in the classical R plots with plot.default(x,y, asp=1,...) and then contour(...,

add=T). When I try aspect=1 with contour plot, I get a square but not at all the aspect ratio I wish: 1 unit on X = one unit on Y =

the same distance on screen. What goes wrong?

2/ I would also be capable to project points and symbols on a contourplot (the equivalent of points() and symbols() after plot() and

contour()), but can hardly guess from the help how to manage with.

3/ I would also appreciate to manage the equivalent of par(mfrow=c(2,2)) -or any other numbers of screens- and have a "Trellis" plot

in each of the sub-screens. It seems that contourplot does not comply with and ignore the above parameters. Right or wrong? If so,

which approach can solve this problem?

Thanks in advance for any hint,

Patrick Giraudoux

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**Next message:**Bernardo Rangel Tura: "Re: [R] Probability(Markov chain transition matrix)"**Previous message:**Prof Brian Ripley: "Re: [R] building a "simple" R package"**Next in thread:**Deepayan Sarkar: "Re: [R] contourplot, xyplot, aspect ratio, mfrow"**Reply:**Deepayan Sarkar: "Re: [R] contourplot, xyplot, aspect ratio, mfrow"

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