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MathGroup Archive 2012

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Surface Smoothing

  • To: mathgroup at smc.vnet.net
  • Subject: [mg127604] Surface Smoothing
  • From: "Nicholas Kormanik" <nkormanik at gmail.com>
  • Date: Mon, 6 Aug 2012 04:38:29 -0400 (EDT)
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This is a follow-up to a post I made last week (included at bottom).

My ListPlot3D output is pretty spiky, with spikes extending above and below.
Quite hard to get a sense where any "sweet spots" might exist -
"neighborhood average" relatively high.

I've looked into using the various forms of Interpolate.  None of those will
"smooth the surface," as they all require passing through the original data
points.

I'm wondering if any of you might know of a third-party Mathematica package
that will do surface smoothing?

Please guide me to such package, if you do.  Or if you know of another
approach that'll get the job done.

Thanks,

Nicholas


From: Nicholas Kormanik [mailto:nkormanik at gmail.com] 
Sent: Friday, August 03, 2012 1:04 AM
To: 'mathgroup at smc.vnet.net'
Subject: [mg127604] ListContourPlot

 

 

I've been attempting to create a contour plot within Mathematica 8.04.

 

I posted to the Mathematica StackExchange, but didn't get a conclusive
answer:

 

http://mathematica.stackexchange.com/questions/8821/creating-optimal-smoothe
d-contour-type-plots-x-y-z-using-mathematica-8-04

 

Hopefully someone here can assist.

 

Here is a link to the data file:

 

http://rapidgator.net/file/29594247/20201_23405_50502.XLS.html

 

Here is a link to an example contour plot, made in another program (SAS):

 

http://rapidgator.net/file/29594680/50502_20201_23405.png.html

 

In case the files do not make it through to you, the data file is an Excel
.xls file with three columns, X,Y,Z.  Z in the contour plot would be shown
by contours or a gradient of colors.

 

If a contour plot isn't possible, perhaps ListPlot3D?

 

The process is far from straight-forward.  Definitely a learning curve
involved.

 

Unfortunately the Mathematica documentation almost exclusively gives
examples using functions and distributions, not standard data columns for
input.

 

Thanks,

Nicholas Kormanik

 


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