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MathGroup Archive 1998

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Problems using TWJ contour for irregular data

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13204] Problems using TWJ contour for irregular data
  • From: Joel Cannon <cannon at alpha.centenary.edu>
  • Date: Mon, 13 Jul 1998 07:42:53 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Does anyone have experience using Tom Wickham-Jones contour function for
generating contour plots from irregularly spaced data (using M3.0)? I
have downloaded the new version of the ExtendGraphics from MathSource
and put the suffix .exe on the binary file compiled with mcc. However,
I am unable to duplicate the example found on page 483 of the book.

I will attempt to past the results out of the notebook below. When
calling either TrianglePlot or ListContourPlot, I get an error message
printed to the shell that launched mathematica saying,  "Assertion
failed: FALSE, file delaunay.tm.c, line 198".  

Thanks for any help you all can provide.

    
    In[1]:=
    Needs["ExtendGraphics`Contour`"]
    
    In[2]:=
    Links[]
    
    Out[2]=
   
{LinkObject["ParentLink",1,1],LinkObject["'/usr/local/mathematica/AddOns/Applications/ExtendGraphics/delaunay.exe'",2,2],LinkObject["'/usr/local/mathematica/AddOns/Applications/ExtendGraphics/contour.exe'",3,3]}
    

(*   Generate an irregularly spaced array of x,y,z points *)

    d1 = Flatten[
    		Table[
    			Table[{r,Sin[t],r^2 Cos[t] Sin[t]},
    				{t,0,2Pi-2Pi/(10r),2Pi/(10 r)}],
    			{r,10}],1];
    
    In[4]:=
    Dimensions[d1]
    
    Out[4]=
    {550,3}
    
(*  Attempt a TrianglePlot with the data *)

    In[5]:=
    TrianglePlot[Map[Take[#,2]&,d1]]
    
    LinkObject::"linkd": "\!\(\\[LeftSkeleton] 1 \\[RightSkeleton]\) is
closed; the connection is dead."
    
    Set::"shape": "Lists \!\({ExtendGraphics`Delaunay`Private`hull,
\(\\[LeftSkeleton] 35 \\[RightSkeleton]\)}\) and \!\($Failed\) are not
the same shape."
    
    Graphics::"gprim": "Unknown \!\(Graphics\) primitive
\!\(ExtendGraphics`Delaunay`Private`tri\) encountered."
    
    Out[5]=
    \[SkeletonIndicator]Graphics\[SkeletonIndicator]
    

(*  Attempt to use ListContourPlot *)

    In[3]:=
    c = ListContourPlot[d1]
    
    LinkObject::"linkd": "\!\(\\[LeftSkeleton] 1 \\[RightSkeleton]\) is
closed; the connection is dead."


------------------------------------------------------------------------------
Joel W. Cannon |   (318)869-5160 
Dept. of Physics   |   (318)869-5026  FAX    Centenary College of
Louisiana |  
P. O. Box 41188		   |	 
Shreveport, LA 71134-1188  |  
 



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