[R] lines in 3d-cloud plot (lattice)

[Tom Blackwell]

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 (Unfortunately, the docs are a bit outdated).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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