Re: st:how to really combine two 3-dimensional graphs (using one x,y,z axis system)

[Nick Cox <njcoxstata@gmail.com>]

Not so.

-col()- just controls the juxtaposition (side by side). There is no
superimposition (graphs of top of each other).

Nick

On Thu, Jan 6, 2011 at 4:09 PM, Steven Samuels <sjsamuels@gmail.com> wrote:
>
> Amanda wrote:
> "I tried -gr combine-, but the output is simply put the two graphs side by
> side".
>
> That's just the default output. The "col(1)" of -graph combine-  will put
> the graphs on top of one another. That and the "nowire" option of -surface-
> should get you close to what you want, as long as the z ranges do not
> overlap.
>
> (On my system. Stata 11, OS X 10.5.8, PB G4,  the -surface- and -saving-
> options don't work, so I can't test this.)
>
>
> Steve
>
>
> On Jan 6, 2011, at 10:10 AM, Nick Cox wrote:
>
> The reference here is to -surface- from SSC. Please remember to
> explain where user-written programs you refer come from; this is a
> very longstanding request on this list.
>
> -graph combine- is just doing precisely what it claims, juxtaposing
> graphs. All you can do with -graph combine- is put graphs side by
> side. There is absolutely no scope for it to do what you want. Nor is
> it surprising that there is no option controlling z-axes; Stata has no
> concept of a z-axis and any appearance to the contrary is just a
> programmer-produced illusion.
>
> What you want I think requires non-trivial Stata programming or
> recourse to other software. Good official support for 3-D graphics has
> been on many users' wishlists for some time, including mine. but as of
> now I don't see a way to do what you want in Stata. (Whether the graph
> could be drawn to work well is a separate issue.)
>
> Nick
>
> On Thu, Jan 6, 2011 at 2:49 PM, Amanda Fu <mandy.fu1@gmail.com> wrote:
>
>> I created two 3-dimensional graphs using -surface- for two groups. I
>> aim to do now is to put the two  in one graph.  I tried -gr combine-,
>> but the output is simply put the two graphs side by side. What I want
>> to get is in one graph, the two groups 3-D graph of both the groups
>> are drawn (they share one x-axis, one y-axis, and one z-axis). I also
>> tried -gr combine, xcommon  ycommon-. The results are the same. And gr
>> combine does not allow the option of  -zcommon- .
>>
>> Is there someone who could give me some suggestions on this? Thank you!

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