Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: 3D plots from lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48744] Re: [mg48706] 3D plots from lists
  • From: Christopher Purcell <christopherpurcell at mac.com>
  • Date: Fri, 11 Jun 2004 23:59:28 -0400 (EDT)
  • References: <200406110752.DAA24891@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Here is a simple example where a text file of triplets of numbers are 
created. These are read back in, an Interpolation of them is created, 
and then we can plot the Interpolation function as a surface. Is this 
what you had in mind?


testdata = Flatten[Table[{x, y, Sin[x y]}, {x, 0, 6, .3}, {y, 0, 6, 
.3}], 1];
Export[ "junk.txt", testdata, "Table"];
stream = OpenRead["junk.txt"];
data = ReadList[stream, {Number, Number, Number}];
Clear[f];
f = Interpolation[data];
  ParametricPlot3D[{x, y, f[x, y]}, {x, Min[data[[All, 1]]], 
Max[data[[All,
     1]]]}, {y, Min[data[[All, 2]]], Max[data[[All, 2]]]}]

P.S. If your Fortran created data set uses E format, you may need to do 
a fancier read of the data, using StringToStream and Read, rather than 
the simpler ReadList.

christopherpurcell at mac.com


On Jun 11, 2004, at 4:52 AM, Giorgio Torrieri wrote:

> This might be naive, but I worked on this problem for days, and the
> users manual seems to be of no help.
>
> I have a 3 column output generated by a FORTRAN program, in the
> following form:
>
> X    Y    F(X,Y)
>
> Is there any way to make Mathematica understand this format and plot
> it with something like ListPlot3D?    It seems to require all 3D plots
> to be square arrays of the form F(X,Y) only, and I would much rather
> not modify the fortran program output.
>
> Thanks for your help
>
> GT
>


  • Prev by Date: Re: using iFFT on a Continuous Time Transfer Function
  • Next by Date: Re: Merging lists if an element in each partially matches?
  • Previous by thread: Re: 3D plots from lists
  • Next by thread: Re: 3D plots from lists