Duncan Murdoch wrote:
> On 1/23/2007 6:38 AM, Atte Tenkanen wrote:
>> Hi,
>>
>> Does somebody know if there is some trick to betoken the starting points
>> ("on the floor") of the vertical lines in scatterplot3d-plots.
>> I'd prefer something like that one in the example here
>>
>> http://users.utu.fi/attenka/proposal3d.jpg
>>
>> If this is not possible, could this option be added? Sometimes it is not
>> easy to distinguish objects behind the others and for instance in this
>> example picture the case nr. 21 is important.
>
> scatterplot3d() returns a list of functions which could help with this,
> in particular the points3d function.
Right, or rather use the returned function xyz.convert, as in:
s3d <- scatterplot3d(1:10, 1:10, 1:10, type="h")
s3d$xyz.convert(5, 5, 0)
Now you got coordinates for the point on the plane with z=0 projected
from (5,5,5). It should be easy now to add circles, ellipses or whatever
you like.
Uwe Ligges
> Duncan Murdoch
>
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