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() > > ------------------------------------------------------------------------------ > 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 > -- Reinier Heeres Tel: +31 6 10852639 ------------------------------------------------------------------------------ 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
