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Re: [matplotlib-devel] [Python-modules-team] Bug#585442: python-matplotlib: crashes when calling axis() after imshow()
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From: Eric F. <ef...@ha...> - 2010-06-22 02:57:44
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On 06/21/2010 12:24 PM, Sandro Tosi wrote: > forwarded 585442 mat...@li... > thanks > > Hello Matplotlib developers, > here below is a report a user of maplotlib sent to the Debian bug > tracker. I've verified and it happend also with 0.99.3: > > $ python -c "import matplotlib as p ; print p.__version__" > 0.99.3 > $ python mpl_crash.py > terminate called after throwing an instance of 'char const*' > Aborted > > Thanks for looking into it, > Sandro Sandro, Thanks for reporting it. With the default interpolation, rendering gets extremely slow as the view limits decline to and below a single image pixel. I suspect the crash is related to this. Neither the slowdown nor the crash occurs with interpolation='nearest', although there is still an anomaly in which the image is blank when the viewlim region is too small. Like Ryan, I am not familiar with the _image.cpp and the underlying agg routines, but I suspect this is going to be a difficult problem to solve. It may be necessary to put in some workaround, trying to trap and prevent the extreme slowdown and crash. The slowdown topic came up on the list years ago. http://www.mail-archive.com/mat...@li.../msg00513.html Eric > > On Thu, Jun 10, 2010 at 16:52, Teemu Ikonen<tpi...@gm...> wrote: >> Package: python-matplotlib >> Version: 0.99.1.2-3 >> Severity: important >> >> Running a program which displays an image with plt.imshow() and changes the >> axes with plt.axis() before calling plt.show() crashes the python interpreter: >> >> $ python mpl_crash.py >> terminate called after throwing an instance of 'char const*' >> Aborted >> >> This happens at least with Qt4Agg, GTKAgg and TKAgg backends. >> >> The example program is attached. >> >> Best, >> >> Teemu >> >> -- System Information: >> Debian Release: squeeze/sid >> APT prefers testing >> APT policy: (500, 'testing') >> Architecture: amd64 (x86_64) >> >> Kernel: Linux 2.6.32-trunk-amd64 (SMP w/4 CPU cores) >> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) >> Shell: /bin/sh linked to /bin/dash >> >> Versions of packages python-matplotlib depends on: >> ii libatk1.0-0 1.30.0-1 The ATK accessibility toolkit >> ii libc6 2.10.2-9 Embedded GNU C Library: Shared lib >> ii libcairo2 1.8.10-4 The Cairo 2D vector graphics libra >> ii libfontconfig1 2.8.0-2.1 generic font configuration library >> ii libfreetype6 2.3.11-1 FreeType 2 font engine, shared lib >> ii libgcc1 1:4.4.4-1 GCC support library >> ii libglib2.0-0 2.24.1-1 The GLib library of C routines >> ii libgtk2.0-0 2.20.1-1 The GTK+ graphical user interface >> ii libpango1.0-0 1.28.0-1 Layout and rendering of internatio >> ii libpng12-0 1.2.43-1 PNG library - runtime >> ii libstdc++6 4.4.4-1 The GNU Standard C++ Library v3 >> ii python 2.5.4-9 An interactive high-level object-o >> ii python-cairo 1.8.8-1+b1 Python bindings for the Cairo vect >> ii python-dateutil 1.4.1-3 powerful extensions to the standar >> ii python-gobject 2.21.1-1 Python bindings for the GObject li >> ii python-matplotlib-data 0.99.1.2-3 Python based plotting system (data >> ii python-numpy 1:1.3.0-3+b1 Numerical Python adds a fast array >> ii python-pyparsing 1.5.2-2 Python parsing module >> ii python-support 1.0.8 automated rebuilding support for P >> ii python-tz 2010b-1 Python version of the Olson timezo >> ii tcl8.5 8.5.8-2 Tcl (the Tool Command Language) v8 >> ii tk8.5 8.5.8-1 Tk toolkit for Tcl and X11, v8.5 - >> ii zlib1g 1:1.2.3.4.dfsg-3 compression library - runtime >> >> Versions of packages python-matplotlib recommends: >> ii python-glade2 2.17.0-2 GTK+ bindings: Glade support >> ii python-tk 2.6.5-1 Tkinter - Writing Tk applications >> >> Versions of packages python-matplotlib suggests: >> ii dvipng 1.13-1 convert DVI files to PNG graphics >> ii ipython 0.10-2 enhanced interactive Python shell >> ii librsvg2-common 2.26.3-1 SAX-based renderer library for SVG >> ii python-configobj 4.7.2+ds-1 simple but powerful config file re >> pn python-excelerator<none> (no description available) >> ii python-gtk2 2.17.0-2 Python bindings for the GTK+ widge >> pn python-matplotlib-doc<none> (no description available) >> pn python-qt3<none> (no description available) >> ii python-qt4 4.7.3-1 Python bindings for Qt4 >> ii python-scipy 0.7.2-1 scientific tools for Python >> ii python-traits 3.3.0-1 Manifest typing and reactive progr >> ii python-wxgtk2.8 2.8.10.1-3 wxWidgets Cross-platform C++ GUI t >> ii texlive-extra-utils 2009-7 TeX Live: TeX auxiliary programs >> ii texlive-latex-extra 2009-7 TeX Live: LaTeX supplementary pack >> >> -- no debconf information >> >> _______________________________________________ >> Python-modules-team mailing list >> Pyt...@li... >> http://lists.alioth.debian.org/mailman/listinfo/python-modules-team >> > > > > > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. 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