SVN r8456 has a patch for the slowness Eric described when doing extreme
magnification on an image.
Unfortunately, this fix paves over the exception fixed earlier. Rather
than getting an exception when the magnification is too high, it now
silently just doesn't draw the image. I'm trying to figure out what the
threshold is beyond which it fails in order to manually raise an
exception, but not having much luck. I suspect it's somehow related to
floating-point or even Agg's fixed-point rounding error.
Mike
On 06/22/2010 12:31 PM, Michael Droettboom wrote:
Ok. Attached is a corrected patch.
Mike
On 06/22/2010 12:26 PM, Michael Droettboom wrote:
Hold off, actually. This patch seems to have broken some thing
inadvertently. Stay tuned...
Mike
On 06/22/2010 12:05 PM, Michael Droettboom wrote:
In r8454, I have a applied a fix that allows this C++ exception to
correctly percolate to the Python side -- the user will still get an
exception, but it will be a Python exception and the interpreter
itself does not crash. (It used to work, but recent changes to CXX
caused it to break.) I have attached this patch to the e-mail.
As Eric suggests, fixing the underlying limitation (I even hesitate
to call it a bug because it is definitely a corner case) requires
understanding some pretty dark depths of the Agg renderer.
Mike
On 06/21/2010 10:57 PM, Eric Firing wrote:
On 06/21/2010 12:24 PM, Sandro Tosi wrote:
forwarded 585442 matplotlib-devel@lists.sourceforge.net
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/matplotlib-devel@lists.sourceforge.net/msg00513.html
Eric
On Thu, Jun 10, 2010 at 16:52, Teemu Ikonen<tpiko...@gmail.com>
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
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