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 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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>
--
Reinier Heeres
Tel: +31 6 10852639
--
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[Matplotlib-users] How to change tick labels?
Hi, I have a very crowded plot with lots of subplots, and tick labels tend to overlap. I wanted to drop e.g. the 1st and last x-tick labels for each subplot, doing something like: ax = P.subplot(1,1,1) ax.plot([1,2,3,2,1,2,3]) ax.set_xticklabels(['']+ [ lbl.get_text() for lbl in ax.get_xticklabels()[1:-1] ]+ ['']) This works in interactive 'ipython -pylab', but this does not work anymore in a script: in my script, the tick label returned by ax.get_xticklabels() are all empty strings: print [ lbl.get_text() for lbl in ax.get_xticklabels() ] returns ['', '', '', '', '', '', ''] It seems the tick text strings are filled in only at the very last moment (at show() time?). Any help out there? Cheers, -- .~. Yannick COPIN (o:>* Doctus cum libro /V\ Institut de physique nucléaire de Lyon // \\ Université de Lyon - CNRS-IN2P3 /( )\ AIM: YnCopin ICQ: 236931013 ^`~'^ http://snovae.in2p3.fr/ycopin/ -- 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] mplot3d bar3d errors
Thanks Reinier,
Yes, upgrading to 0.99.1 seems to have fixed the problem.
One slight oddity: the package I downloaded from the SF page linked at
[2] had a filename of matplotlib-0.99.1.2.tar.gz however inside the
tarball is a directory named matplotlib-0.99.1.1 and the PKG-INFO file
also says 0.99.1.1
Perhaps a packaging bug?
thanks again,
-Derek
On Wed, Jan 27, 2010 at 2:59 AM, Reinier Heeres wrote:
> 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 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.
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[Matplotlib-users] defining/saving contours without plotting
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
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] 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
Hi Jon, one thing you can do is to get the (x, y)-values of the calculated contourlines: cs = plt.contour(z, levels=[0]) a = cs.collections[0].get_paths()[0].vertices # -> array of shape (..., 2) hold x and y in first and second column I don't know wheter this is the best way, but at least for me it works. Kind regards, Matthias On Wednesday 27 January 2010 15:14:27 Jonathan Slavin wrote: > 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 -- 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
