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Re: help with 3D scatter plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg41989] Re: help with 3D scatter plot
  • From: "seferiad" <seferiad at pacbell.net>
  • Date: Mon, 16 Jun 2003 03:56:43 -0400 (EDT)
  • References: <bbroh0$j3e$1@smc.vnet.net> <bc46j5$ktd$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Jens,
Where/how do I imbed the statement regarding titles of the respective axes?
Thanks, Jay


"Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de> wrote in message
news:bc46j5$ktd$1 at smc.vnet.net...
> Hi,
>
>
> data = Table[(xx = 2*Random[]; yy = 2*Random[]; {xx, yy, Sin[xx*yy]}),
> {100}];
>
> fitfun = Chop[Fit[data, {1, x, y, x*y}, {x, y}]];
>
>
> Block[{$DisplayFunction = Identity},
>   g1 = Plot3D[Evaluate[fitfun], {x, 0, 2}, {y, 0, 2}];
>   g2 = Graphics3D[{
>            {AbsolutePointSize[4], Point /@ data},
>           Line[{Append[Take[#, 2], 0], #}] & /@ data}
>       ];
>   ]
> Show[g1, g2]
>
>
> Regards
>   Jens
>
> seferiad wrote:
> >
> > Hello,
> > I have Mathematica 4 and have two questions.
> > 1) I have a 3D scatter plot, and I would like to do a least squares fit
to
> > the data, and display the R^2 value. Since the graph is 3D, the curve
fit
> > should be a surface.  I don't think I can do this conveniently, has
anyone
> > found a work around for this?
> >
> > 2) Also, it is difficult to visualize the location of the data in the
plot,
> > with or without the grids.  I once saw another graph (it may have been
Igor
> > software?) in which each of the data points were attached to lines that
were
> > parallel to the z-axis and stopped at the x-y plane. This is a very nice
> > feature. Is there something equivalent in Mathematica to help improve
with
> > being able to visualize the graph?  Thanks, Jay
>


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