[R] Two questions about cloud().

[Rolf Turner]

On 5/11/2009, at 6:49 PM, Deepayan Sarkar wrote:

> On Tue, Nov 3, 2009 at 3:57 PM, Rolf Turner  
> <r.turner at auckland.ac.nz> wrote:
>>
>>
>> (1) Is there a (simple) way of getting cloud() to do *both*
>> type="p" and type="h"?  I.e. of getting it to plot the points
>> as points *and* drop a perpendicular line to the underlying plane?
>
> Yes, 'type' can be a vector, similar to the behaviour in xyplot():
>
> cloud(Sepal.Length ~ Petal.Length * Petal.Width, data = iris, type =
> c("p", "h"))
>

	Ah-ha.  That's great.  I guess I should RTFM more carefully.

>> (2) Is there a way of telling cloud() to drop its lines to the
>> floor of the bounding box, rather than to the plane z=0?
>> I thought that the "zero.scaled" argument (for panel.3dscatter())
>> might be the ticket here, but when I pass this argument to cloud()
>> I get an error ``Error using packet 1 formal argument "zero.scaled"
>> matched by multiple actual arguments".
>
> There doesn't seem to be an easy way. (To use 'zero.scaled', you would
> need a custom panel.3d.cloud argument which captures 'zero.scaled' and
> replaces it, etc., which is not really what you should need to do.)

	I thought there might be a strategy like that, but I wanted to
	check first and see if there was something simpler.

	This may give me a workaround for the context in which I currently
	need to do this.  I'll give it a go.
>
> Unless you are using arrows=FALSE on the z-axis, you could easily fake
> it by increasing the z-values (e.g., z-min(z)).

	Don't really understand this.  (Sorry; I'm a thicko.)  I'll
	fiddle about and see what I can shake out of the tree.
>
> Longer term, I could add an 'origin' argument to panel.cloud, similar
> to what panel.barchart supports. Would that suffice for you? You would
> still need to pre-compute the origin, in this case the lower zlim.

	Yes, that should be fine.  Thanks.

		cheers,

			Rolf

######################################################################
Attention:\ This e-mail message is privileged and confid...{{dropped:9}}