Fwd: Gnuplot 3D suface color coded by altitude

[drew einhorn]

Arghh.  The images are too big for this list.

And I've never seen a moderator actually approve
a message with attachements that are too big.
Maybe I'm not patient enough.

Anway this is probably understandable from
the text talking about the images.  If anybody
needs to see the images I'll put them up on a
webserver.


---------- Forwarded message ----------
From: drew einhorn <drew.einhorn at gmail.com>
Date: Tue, Apr 8, 2008 at 9:33 AM
Subject: Gnuplot 3D suface color coded by altitude
To: ubuntu-users at lists.ubuntu.com


Tried sending this to the info-gnuplot list.
 But it's not at any of the published locations I've found:

    majordomo at dartmouth.edu
    majordomo at lists.sourceforge.net

 Anybody know the correct location of this list?

 Back to my immediate problem:

    Gnuplot 3D suface color coded by altitude


 So far the only way I have found to do it is with pm3d and pallete.

  Here is the gnuplot commands I put together by combing code
  from a couple of examples, without really understanding the details

  set terminal x11
  set title "Iozone - Read Performance"
  set grid lt 2 lw 1
  unset surface
  set xtics
  set ytics
  set logscale x 2
  set logscale y 2
  set autoscale z
  set xrange [2.**5:2.**24]
  set xlabel "File size in 2^n KBytes"
  set ylabel "Record size in 2^n Kbytes"
  set zlabel "Kbytes/sec"
  set data style lines
  set dgrid3d 80,80,3
  set pm3d; set palette
  splot 'read/iozone_gen_out.gnuplot' using 1:2:3
  pause -1 "Hit return to continue"

  Attached is datafile from  'read/iozone_gen_out.gnuplot'
  the resulting image viewed from a couple directions.

  Screenshot-1 is viewed from above so we can easily
  read the x and y coordinates.

  Screenshot-2 is view from an angle so we can see
  the 3D shapes.

  Screenshot-2 looks awfully bumpy.  This is an
  artifact of generating the 3D surface which we
  can see clearly in Screenshot-1.

  All of our data points are on a rectangular grid
  at the tick marks,

  Data values between tick marks are interpolated
  somehow by the surface generating algorithm.

  If we look at the high value yellow data points
  we see theat the interpolated values are hanging
  down into the orange.

  And if we look at the low value black data points
  we see that the intepolated values are rising up
  into blue.

  Here's how I would like to see the 3D surface
  generated.  When viewing the xy plane from
  above above we have all our data points on
  a the corners of little squares.  I'd like to add
  interpolated data points at the center of the
  little squares with the z value being the
  average of the 4 corners.  This technique is
  certainly well know and has a name I could
  use in a google search (if I knew it).

  --
  Drew Einhorn



 --
 Drew Einhorn



-- 
Drew Einhorn
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