On 5/11/2009, at 6:49 PM, Deepayan Sarkar wrote:
> On Tue, Nov 3, 2009 at 3:57 PM, Rolf Turner
> <
[hidden email]> 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
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