lines in 3d-cloud plot (lattice)

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 (Unfortunately, the docs are a bit outdated).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