[SciPy-user] How to draw a 3D graphic of a function?

Johann Cohen-Tanugi cohen@slac.stanford....
Tue Apr 15 03:02:29 CDT 2008


I think that the whole 3D part of matplotlib is now broken. There are 
discussions but not a lot of work yet as to how to get this 
functionnality back. Might be via VTK....
best,
J.

James A. Bednar wrote:
> |  From: Joshua Lippai
> |  Date: Apr 14 10:27:52 2008 -0700
> |  
> |  I can't import matplotlib.axes3d using a 0.98pre SVN build. Here's my output:
> |  
> |  In [3]: from matplotlib import axes3d
> |  ---------------------------------------------------------------------------
> |  ImportError                               Traceback (most recent call last)
> |  
> |  /Users/Josh/<ipython console> in <module>()
> |  
> |  /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/matplotlib/axes3d.py
> |  in <module>()
> |       14 from axes import Axes
> |       15 import cbook
> |  ---> 16 from transforms import unit_bbox
> |       17
> |       18 import numpy as npy
> |  
> |  ImportError: cannot import name unit_bbox
>
> That sounds like something to report to the matplotlib list.  I just
> checked on the latest released version of matplotlib (0.91.2), and it
> still works on that version.
>
> Jim
>
> |  On Sun, Apr 13, 2008 at 12:22 AM, James A. Bednar <jbednar@inf.ed.ac.uk> wrote:
> |  > |  Date: Fri, 11 Apr 2008 15:02:03 +0200
> |  >  |  From: Gael Varoquaux <gael.varoquaux@normalesup.org>
> |  >
> |  > |
> |  >  |  On Fri, Apr 11, 2008 at 08:57:50PM +0800, zhang chi wrote:
> |  >  |  >  I want to draw a matrix of 100 X 100, its elements are the values of a function.
> |  >  |
> |  >  |  I suppose you want to map the value of your matrix to the altitude of a
> |  >  |  surface?
> |  >  |
> |  >  |  You can do this with Mayavi2. Have a look at the user guide,
> |  >
> |  >  As shown below, you can also do this with matplotlib, which more
> |  >  people will probably have installed. There was a suggestion that I add
> |  >  this to the matplotlib cookbook, but I still haven't gotten a chance
> |  >  to do so...
> |  >
> |  >  Jim
> |  >
> |  >  |  Date: Tue, 02 Oct 2007 04:56:56 -0400
> |  >  |  From: Joe Harrington <jh@physics.ucf.edu>
> |  >  |
> |  >  |  Or, you could just do it with matplotlib...
> |  >  |
> |  >  |  http://physicsmajor.wordpress.com/2007/04/22/3d-surface-with-matplotlib/
> |  >  |
> |  >  |  This was the first hit on a google search for "matplotlib surface".  I
> |  >  |  tested it and it works in 0.90.1.
> |  >
> |  >  Interesting!  I couldn't find any documentation at all, but after some
> |  >  hacking on that script I was able to make matplotlib 0.90.1 plot a
> |  >  wireframe surface for a 2D numpy array, so I thought it could be
> |  >  useful to include the code (below).
> |  >
> |  >  Note that the original example uses plot_surface instead of
> |  >  plot_wireframe, but I've found plot_surface to be quite buggy, with
> |  >  plots disappearing entirely much of the time, while plot_wireframe has
> |  >  been reliable so far.  There is also contour3D, though that doesn't
> |  >  look very useful yet.  Hopefully these 3D plots will all be polished
> |  >  up a bit and made public in a new matplotlib release soon!
> |  >
> |  >  Jim
> |  >  _______________________________________________________________________________
> |  >
> |  >  import pylab
> |  >  from numpy import outer,arange,cos,sin,ones,zeros,array
> |  >  from matplotlib import axes3d
> |  >
> |  >  def matrixplot3d(mat,title=None):
> |  >     fig = pylab.figure()
> |  >     ax = axes3d.Axes3D(fig)
> |  >
> |  >     # Construct matrices for r and c values
> |  >     rn,cn = mat.shape
> |  >     c = outer(ones(rn),arange(cn*1.0))
> |  >     r = outer(arange(rn*1.0),ones(cn))
> |  >
> |  >     ax.plot_wireframe(r,c,mat)
> |  >
> |  >     ax.set_xlabel('R')
> |  >     ax.set_ylabel('C')
> |  >     ax.set_zlabel('Value')
> |  >
> |  >     if title: windowtitle(title)
> |  >     pylab.show()
> |  >
> |  >
> |  >  matrixplot3d(array([[0.1,0.5,0.9],[0.2,0.1,0.0]]))
> |  >
> |  >
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> |  >  Scotland, with registration number SC005336.
> |  >
> |  >
> |  >
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