## matplotlib-users

 [Matplotlib-users] Req: Matplotlib compatibility problem - help please! From: David Williams - 2011-01-20 22:58:24 Hi folks I am teaching myself Python by working through Hans Petter Langtangen's excellent book "Primer on Scientific Programming in Python". The exercises in chapter 4 of the book require the student to use Python with the freely downloadable tools MatplotLib and SciTools to plot graphs of mathematical functions. Despite downloading and installing numerous different versions of Python 2.x, MatPlotLib and SciTools, I am unable to find a combination which will work together without crashing. I'm currently using a Windows XP laptop with: Python 2.6.6 IDLE 2.6.6 MatplotLib 0.99,3 win32 Py2.6 Scitools from scipy-0.80-win32-superpack-python 2.6 When I try to run a simple script to test the plotting functions, I get the error messages attached below. I don't want to use Python 3, as there still seem to be some teething problems with this, and many of the modules that I've already written or need to use are not compatible with Python 3.x. I've emailed the author, but have not yet had a reply. I'd be very grateful if you could explain why I get the error messages shown below, what is a compatible combination of versions of Python 2.x, MatPlotLib and Scitools; and the URL of sites where I can download these. Many thanks in anticipation Dave (UK) ============================= Test script: 1. from scitools.std import * 2. 3. def f(t): 4. return t**2*exp(-t**2) 5. 6. t = linspace(0,3,51) 7. y = zeros(len(t)) 8. for i in xrange(len(t)): 9. y[i] = f(t[i]) 10. 11. plot(t,y) 12. 13. =============================== >>> scitools.easyviz backend is matplotlib Traceback (most recent call last): File "C:\Python\Dave_Book Exercises\4_3_2 Plot test_DW.py", line 11, in plot(t,y) File "C:\Python26\lib\site-packages\scitools\easyviz\common.py", line 3060, in plot self._replot() File "C:\Python26\lib\site-packages\scitools\easyviz\matplotlib_.py", line 906, in _replot self._g.draw() File "C:\Python26\lib\site-packages\matplotlib\pyplot.py", line 352, in draw get_current_fig_manager().canvas.draw() File "C:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 215, in draw FigureCanvasAgg.draw(self) File "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py", line 314, in draw self.figure.draw(self.renderer) File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python26\lib\site-packages\matplotlib\figure.py", line 773, in draw for a in self.axes: a.draw(renderer) File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 1735, in draw a.draw(renderer) File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python26\lib\site-packages\matplotlib\axis.py", line 742, in draw tick.draw(renderer) File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python26\lib\site-packages\matplotlib\axis.py", line 196, in draw self.label1.draw(renderer) File "C:\Python26\lib\site-packages\matplotlib\text.py", line 518, in draw bbox, info = self._get_layout(renderer) File "C:\Python26\lib\site-packages\matplotlib\text.py", line 280, in _get_layout clean_line, self._fontproperties, ismath=ismath) File "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py", line 148, in get_text_width_height_descent texmanager = self.get_texmanager() File "C:\Python26\lib\site-packages\matplotlib\backend_bases.py", line 374, in get_texmanager from matplotlib.texmanager import TexManager File "C:\Python26\lib\site-packages\matplotlib\texmanager.py", line 72, in class TexManager: File "C:\Python26\lib\site-packages\matplotlib\texmanager.py", line 94, in TexManager _dvipng_hack_alpha = dvipng_hack_alpha() File "C:\Python26\lib\site-packages\matplotlib\texmanager.py", line 68, in dvipng_hack_alpha raise RuntimeError('Could not obtain dvipng version') RuntimeError: Could not obtain dvipng version >>> 
 Re: [Matplotlib-users] Req: Matplotlib compatibility problem - help please! From: Christoph Gohlke - 2011-01-21 00:55:26 Try the solution proposed at ; Christoph On 1/20/2011 2:42 PM, David Williams wrote: > Hi folks > > I am teaching myself Python by working > through Hans Petter Langtangen's > excellent book "Primer on Scientific > Programming in Python". > > The exercises in chapter 4 of the book > require the student to use Python with > the freely downloadable tools > MatplotLib and SciTools to plot graphs > of mathematical functions. > > Despite downloading and installing > numerous different versions of Python > 2.x, MatPlotLib and SciTools, I am > unable to find a combination which > will work together without crashing. > > I'm currently using a Windows XP > laptop with: > Python 2.6.6 > IDLE 2.6.6 > MatplotLib 0.99,3 win32 Py2.6 > Scitools from > scipy-0.80-win32-superpack-python 2.6 > > When I try to run a simple script to > test the plotting functions, I get the > error messages attached below. > > I don't want to use Python 3, as there > still seem to be some teething > problems with this, and many of the > modules that I've already written or > need to use are not compatible with > Python 3.x. > > I've emailed the author, but have not > yet had a reply. > > I'd be very grateful if you could > explain why I get the error messages > shown below, what is a compatible > combination of versions of Python 2.x, > MatPlotLib and Scitools; and the URL > of sites where I can download these. > > Many thanks in anticipation > > > Dave > (UK) > > ============================= > Test script: > > 1. from scitools.std import * > 2. > 3. def f(t): > 4. return t**2*exp(-t**2) > 5. > 6. t = linspace(0,3,51) > 7. y = zeros(len(t)) > 8. for i in xrange(len(t)): > 9. y[i] = f(t[i]) > 10. > 11. plot(t,y) > 12. > 13. > > =============================== > >>>> > scitools.easyviz backend is matplotlib > > Traceback (most recent call last): > File "C:\Python\Dave_Book > Exercises\4_3_2 Plot test_DW.py", line > 11, in > plot(t,y) > File > "C:\Python26\lib\site-packages\scitools\easyviz\common.py", > line 3060, in plot > self._replot() > File > "C:\Python26\lib\site-packages\scitools\easyviz\matplotlib_.py", > line 906, in _replot > self._g.draw() > File > "C:\Python26\lib\site-packages\matplotlib\pyplot.py", > line 352, in draw > get_current_fig_manager().canvas.draw() > File > "C:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", > line 215, in draw > FigureCanvasAgg.draw(self) > File > "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py", > line 314, in draw > self.figure.draw(self.renderer) > File > "C:\Python26\lib\site-packages\matplotlib\artist.py", > line 46, in draw_wrapper > draw(artist, renderer, *args, > **kwargs) > File > "C:\Python26\lib\site-packages\matplotlib\figure.py", > line 773, in draw > for a in self.axes: a.draw(renderer) > File > "C:\Python26\lib\site-packages\matplotlib\artist.py", > line 46, in draw_wrapper > draw(artist, renderer, *args, > **kwargs) > File > "C:\Python26\lib\site-packages\matplotlib\axes.py", > line 1735, in draw > a.draw(renderer) > File > "C:\Python26\lib\site-packages\matplotlib\artist.py", > line 46, in draw_wrapper > draw(artist, renderer, *args, > **kwargs) > File > "C:\Python26\lib\site-packages\matplotlib\axis.py", > line 742, in draw > tick.draw(renderer) > File > "C:\Python26\lib\site-packages\matplotlib\artist.py", > line 46, in draw_wrapper > draw(artist, renderer, *args, > **kwargs) > File > "C:\Python26\lib\site-packages\matplotlib\axis.py", > line 196, in draw > self.label1.draw(renderer) > File > "C:\Python26\lib\site-packages\matplotlib\text.py", > line 518, in draw > bbox, info = > self._get_layout(renderer) > File > "C:\Python26\lib\site-packages\matplotlib\text.py", > line 280, in _get_layout > clean_line, self._fontproperties, > ismath=ismath) > File > "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py", > line 148, in > get_text_width_height_descent > texmanager = self.get_texmanager() > File > "C:\Python26\lib\site-packages\matplotlib\backend_bases.py", > line 374, in get_texmanager > from matplotlib.texmanager import > TexManager > File > "C:\Python26\lib\site-packages\matplotlib\texmanager.py", > line 72, in > class TexManager: > File > "C:\Python26\lib\site-packages\matplotlib\texmanager.py", > line 94, in TexManager > _dvipng_hack_alpha = > dvipng_hack_alpha() > File > "C:\Python26\lib\site-packages\matplotlib\texmanager.py", > line 68, in dvipng_hack_alpha > raise RuntimeError('Could not obtain > dvipng version') > RuntimeError: Could not obtain dvipng > version >>>> > > ------------------------------------------------------------------------------ > Special Offer-- Download ArcSight Logger for FREE (a \$49 USD value)! > Finally, a world-class log management solution at an even better price-free! > Download using promo code Free_Logger_4_Dev2Dev. Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@... > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > >