Re: [Matplotlib-users] mplot3d bar3d errors
Hi Derek,
I just tried your program with the latest svn version and that seems
to work fine, so I'd suggest you try that as well [1]. It looks to me
like the fix should be present in 0.99.1-2 too [2].
Please let me know if you still run into the same problem.
Cheers,
Reinier
[1] http://matplotlib.sourceforge.net/faq/installing_faq.html#install-from-svn
[2]
http://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-0.99.1/
On Wed, Jan 27, 2010 at 3:08 AM, Derek Schuff dsch...@purdue.edu wrote:
Hi all,
I'm getting strange errors trying to use the bar3d method in mplot3d
(I'm using matplotlib 0.99.0 in Ubuntu 9.10 and Python 2.6).
I'm doing something roughly like the example at
http://matplotlib.sourceforge.net/examples/mplot3d/hist3d_demo.html
I've pasted my sample program below, which has 2 cases: In case 1, you
see just what you would expect: 2 rows of bars with increasing size in
the y direction. if you uncomment case 2 (for different bar heights),
you get the following error:
Traceback (most recent call last):
File /usr/lib/pymodules/python2.6/matplotlib/backends/backend_gtk.py,
line 352, in expose_event
self._render_figure(self._pixmap, w, h)
File /usr/lib/pymodules/python2.6/matplotlib/backends/backend_gtkagg.py,
line 75, in _render_figure
FigureCanvasAgg.draw(self)
File /usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py,
line 314, in draw
self.figure.draw(self.renderer)
File /usr/lib/pymodules/python2.6/matplotlib/artist.py, line 46,
in draw_wrapper
draw(artist, renderer, *kl)
File /usr/lib/pymodules/python2.6/matplotlib/figure.py, line 774, in draw
for a in self.axes: a.draw(renderer)
File /usr/lib/pymodules/python2.6/mpl_toolkits/mplot3d/axes3d.py,
line 135, in draw
for col in self.collections]
File /usr/lib/pymodules/python2.6/mpl_toolkits/mplot3d/art3d.py,
line 334, in do_3d_projection
z_segments_2d.sort(reverse=True)
ValueError: The truth value of an array with more than one element is
ambiguous. Use a.any() or a.all()
This error gets thrown any time the 2 bars in the same y position have
exactly the same z value: in the sample program the (0,0) value and
(0,1) value are both 1 but it works for any of the 4 pairs. The error
is particularly confusing. even looking at the source of the sort line
in the backtrace, it's not clear where any arrays are being used as
truth values. (just compared for the sort). This can be worked around
by adding a tiny delta to the z values in one of the rows: it only
errors when the corresponding z values match exactly.
Am I doing something wrong here? or is this some kind of bug in the
drawing code?
thanks,
-Derek
the program:
#!/usr/bin/env python2.6
import matplotlib.pyplot as plot
import mpl_toolkits.mplot3d
import numpy
fig2 = plot.figure()
ax2 = mpl_toolkits.mplot3d.Axes3D(fig2)
xpos = numpy.asarray([0, 1, 2, 4, 0, 1, 2, 4])
ypos = numpy.asarray([0, 0, 0, 0, 1, 1, 1, 1])
zpos = numpy.zeros_like(xpos)
dx = 0.05 * numpy.ones_like(zpos)
dy = numpy.ones_like(zpos)
#case 1
dz = numpy.asarray([1,2,3,4,5,6,7,8])
#case 2
#dz = numpy.asarray([1,2,3,4,1,6,7,8])
ax2.bar3d(ypos, xpos, zpos, dy, dx, dz, color='b')
ax2.set_xlabel('X')
ax2.set_ylabel('Y')
ax2.set_zlabel('Z')
plot.show()
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Tel: +31 6 10852639
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To matplotusers: I want to create a plot that has an image and overplots contours, but the contours are defined relative to different data from that plotted in the image. Is there a way to save contour line data rather than plot it. It just occurred to me a way of creating the plot -- but I'm still interested in a way to save contour data. Jon -- __ Jonathan D. Slavin Harvard-Smithsonian CfA jsla...@cfa.harvard.edu 60 Garden Street, MS 83 phone: (617) 496-7981 Cambridge, MA 02138-1516 cell: (781) 363-0035 USA __ -- The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] plot coordinates points
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Re: [Matplotlib-users] plot coordinates points
Hi, do you mean a single point with coordinates x and y like plot([1.2], [2.5], marker='+') Regards, Matthias On Wednesday 27 January 2010 17:26:39 franck kalala wrote: Hey all how to plot a point coordinates in matplotlib? I want for example to plot the point of coordinates x=1.2,y=2.5 Cheers -- The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] defining/saving contours without plotting
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