Hi Staying with Trellis graphics, and depending on what sort of lines you want to add, you could do something similar to persp() example # 2 using cloud() by writing your own panel.3d.cloud() function, which calls panel.3dscatter() and then does some further drawing. This is an analogue to "the sequence plot(), followed by points() or lines() in the base plotting functions", all done within a lattice panel function. From a quick look at help(panel.cloud) it looks like the required transformation information is available via something like ltransform3dto3d(). Paul
Tom Blackwell wrote:
Pascal -
Getting away from Trellis graphics, you might consider using
persp() with regular graphics. Look at example # 2 under
help("persp").
- tom blackwell - u michigan medical school - ann arbor -
On Fri, 30 Jan 2004, Deepayan Sarkar wrote:
On Friday 30 January 2004 06:13, Pascal A. Niklaus wrote:
Hi all, I'd like to plot a set of data (x,y,z) as 3D-cloud, and add several line plots to the same 3D graph: Two questions: 1) How do I connect points to get a line?
cloud(z~x*y,data=d,zlim=c(0,1)) # works cloud(z~x*predict(l),data=d,zlim=c(0,1),type="l") # type="l" doesn't
Warning message: type = l not implemented, consider using 'panel.3d.cloud = panel.3dscatter.old' in: panel.3d.cloud(x = x, y = y, z = z, rot.mat = rot.mat, za = za,
Well, have you considered taking the hint and try
cloud(z~x*predict(l),data=d,zlim=c(0,1),type="l",
panel.3d.cloud = panel.3dscatter.old)
?
help.search("panel.3d.cloud") also didn't report any hits.
panel.3d.cloud is the name of an argument to the panel.cloud function. See ?panel.cloud for details. (Unfortunately, the docs are a bit outdated). Briefly, panel.3dscatter.old is a very simple function, that calculates the 2D projections of the given 3D points and then calls panel.xyplot with those. Any 'type' argument which works with panel.xyplot would also work here, including 'p' and 'l'. But no consideration is made of the fact that these are 3D data. For instance, type = 'h' would not give you what you would expect. panel.3dscatter (the newer version) is a bit more sophisticated. For type = 'p', it draws the points in order of increasing depth, so that closer points overwrite distant ones. Unfortunately, a collection of line segments is not well ordered, and I haven't decided yet what to do in that case (which is why the older version is still retained).
2) How do I superimpose a second data set onto the same graph? (something equivalent to the sequence plot(), followed by points() or lines() in the base plotting functions)
I'm not sure what you mean. Trellis plots are not supposed to be used for two unrelated data sets, they are typically very much dependent on the structure of the data set. Maybe we could help if you give more details of what exactly you want to do, but before that you should read the ?panel.cloud help page carefully, since anything 'special' would almost invariably involve playing with things documented there. Hth, Deepayan
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Dr Paul Murrell Department of Statistics The University of Auckland Private Bag 92019 Auckland New Zealand 64 9 3737599 x85392 paul at stat.auckland.ac.nz http://www.stat.auckland.ac.nz/~paul/