[Python-modules-team] Bug#573179: "AttributeError: 'numpy.bool_' object has no attribute '_mask'" whenever imshow'ing masked array

forwarded 573179 matplotlib-devel@lists.sourceforge.net
thanks

Hello Matplotlib developers,
I'm forwarding this bug a Debian user reported some days ago. It would
be nice it you could give it a look

Thanks in advance,
Sandro

···

On Tue, Mar 9, 2010 at 17:05, Yaroslav Halchenko <debian@...825...> wrote:

Package: python-matplotlib
Version: 0.99.1.2-3
Severity: normal

throws an exception while comparing two masked arrays which have no values (all
masked out)... sure thing it can't determine vmin/vmax to be used (unless clim
is used explicitely), but the exception which is thrown is non-informative. I
thought that upstream might want to make it more user-friendly -- please
forward upstream.

Here is the code to reproduce:
import pylab as pl
import numpy as np

size = (5, 5)
d = np.ones(size)
mask = d.astype(bool)

md = np.ma.masked_array(d, mask)
pl.imshow(md)
# explicit clim would eliminate the problem
#pl.clim(0, 1)
pl.colorbar()

and here is the traceback:

Traceback (most recent call last):
File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 1417, in __call__
return self.func(*args)
File "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 212, in resize
self.show()
File "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 215, in draw
FigureCanvasAgg.draw(self)
File "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_agg.py", line 314, in draw
self.figure.draw(self.renderer)
File "/usr/lib/pymodules/python2.5/matplotlib/artist.py", line 46, in draw_wrapper
draw(artist, renderer, *kl)
File "/usr/lib/pymodules/python2.5/matplotlib/figure.py", line 773, in draw
for a in self.axes: a.draw(renderer)
File "/usr/lib/pymodules/python2.5/matplotlib/artist.py", line 46, in draw_wrapper
draw(artist, renderer, *kl)
File "/usr/lib/pymodules/python2.5/matplotlib/axes.py", line 1701, in draw
im.draw(renderer)
File "/usr/lib/pymodules/python2.5/matplotlib/artist.py", line 46, in draw_wrapper
draw(artist, renderer, *kl)
File "/usr/lib/pymodules/python2.5/matplotlib/image.py", line 237, in draw
im = self.make_image(renderer.get_image_magnification())
File "/usr/lib/pymodules/python2.5/matplotlib/image.py", line 182, in make_image
x = self.to_rgba(self._A, self._alpha)
File "/usr/lib/pymodules/python2.5/matplotlib/cm.py", line 166, in to_rgba
x = self.norm(x)
File "/usr/lib/pymodules/python2.5/matplotlib/colors.py", line 763, in __call__
elif vmin==vmax:
File "/usr/lib/python2.5/site-packages/numpy/ma/core.py", line 3119, in __eq__
check._mask = mask
AttributeError: 'numpy.bool_' object has no attribute '_mask'

-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (901, 'unstable'), (900, 'testing'), (300, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.31-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-matplotlib depends on:
ii libatk1.0-0 1.28.0-1 The ATK accessibility toolkit
ii libc6 2.10.2-5 Embedded GNU C Library: Shared lib
ii libcairo2 1.8.8-2 The Cairo 2D vector graphics libra
ii libfontconfig1 2.8.0-2 generic font configuration library
ii libfreetype6 2.3.11-1 FreeType 2 font engine, shared lib
ii libgcc1 1:4.4.2-2 GCC support library
ii libglib2.0-0 2.22.4-1 The GLib library of C routines
ii libgtk2.0-0 2.18.6-1 The GTK+ graphical user interface
ii libpango1.0-0 1.26.0-1 Layout and rendering of internatio
ii libpng12-0 1.2.40-1 PNG library - runtime
ii libstdc++6 4.4.2-2 The GNU Standard C++ Library v3
ii python 2.5.4-9 An interactive high-level object-o
ii python-cairo 1.8.6-1 Python bindings for the Cairo vect
ii python-dateutil 1.4.1-3 powerful extensions to the standar
ii python-gobject 2.16.1-1 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 1.5.2-1 Python parsing module
ii python-support 1.0.6.1 automated rebuilding support for P
ii python-tz 2009l-1 Python version of the Olson timezo
ii tcl8.5 8.5.7-1 Tcl (the Tool Command Language) v8
ii tk8.5 8.5.7-1 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 2.16.0-1 GTK+ bindings: Glade support
ii python-tk 2.5.2-1.1 Tkinter - Writing Tk applications

Versions of packages python-matplotlib suggests:
ii dvipng 1.11-1 convert DVI files to PNG graphics
ii ipython 0.10-1 enhanced interactive Python shell
ii librsvg2-common 2.26.0-1 SAX-based renderer library for SVG
ii python-configobj 4.5.2-2 a simple but powerful config file
pn python-excelerator <none> (no description available)
ii python-gtk2 2.16.0-1 Python bindings for the GTK+ widge
ii python-matplotlib-doc 0.99.0-1 Python based plotting system (docu
pn python-qt3 <none> (no description available)
ii python-qt4 4.6-1 Python bindings for Qt4
ii python-scipy 0.7.0-2+b1 scientific tools for Python
ii python-traits 3.2.0-1 Manifest typing and reactive progr
ii python-wxgtk2.8 2.8.10.1-3 wxWidgets Cross-platform C++ GUI t
ii texlive-extra-utils 2007.dfsg.2-7 TeX Live: TeX auxiliary programs
ii texlive-latex-extra 2007.dfsg.17-2 TeX Live: LaTeX supplementary pack

-- no debconf information

_______________________________________________
Python-modules-team mailing list
Python-modules-team@...633...
http://lists.alioth.debian.org/mailman/listinfo/python-modules-team

--
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi

Sandro Tosi wrote:

forwarded 573179 matplotlib-devel@lists.sourceforge.net
thanks

Hello Matplotlib developers,
I'm forwarding this bug a Debian user reported some days ago. It would
be nice it you could give it a look

Using svn trunk mpl and numpy 1.5.0.dev8042, I can't reproduce it; I get a blank figure and a blank colorbar, with no exception. I suspect the difference is in numpy.ma, not matplotlib.

Eric

···

Thanks in advance,
Sandro

On Tue, Mar 9, 2010 at 17:05, Yaroslav Halchenko <debian@...825...> wrote:

Package: python-matplotlib
Version: 0.99.1.2-3
Severity: normal

throws an exception while comparing two masked arrays which have no values (all
masked out)... sure thing it can't determine vmin/vmax to be used (unless clim
is used explicitely), but the exception which is thrown is non-informative. I
thought that upstream might want to make it more user-friendly -- please
forward upstream.

Here is the code to reproduce:
import pylab as pl
import numpy as np

size = (5, 5)
d = np.ones(size)
mask = d.astype(bool)

md = np.ma.masked_array(d, mask)
pl.imshow(md)
# explicit clim would eliminate the problem
#pl.clim(0, 1)
pl.colorbar()

and here is the traceback:

Traceback (most recent call last):
File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 1417, in __call__
   return self.func(*args)
File "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 212, in resize
   self.show()
File "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_tkagg.py", line 215, in draw
   FigureCanvasAgg.draw(self)
File "/usr/lib/pymodules/python2.5/matplotlib/backends/backend_agg.py", line 314, in draw
   self.figure.draw(self.renderer)
File "/usr/lib/pymodules/python2.5/matplotlib/artist.py", line 46, in draw_wrapper
   draw(artist, renderer, *kl)
File "/usr/lib/pymodules/python2.5/matplotlib/figure.py", line 773, in draw
   for a in self.axes: a.draw(renderer)
File "/usr/lib/pymodules/python2.5/matplotlib/artist.py", line 46, in draw_wrapper
   draw(artist, renderer, *kl)
File "/usr/lib/pymodules/python2.5/matplotlib/axes.py", line 1701, in draw
   im.draw(renderer)
File "/usr/lib/pymodules/python2.5/matplotlib/artist.py", line 46, in draw_wrapper
   draw(artist, renderer, *kl)
File "/usr/lib/pymodules/python2.5/matplotlib/image.py", line 237, in draw
   im = self.make_image(renderer.get_image_magnification())
File "/usr/lib/pymodules/python2.5/matplotlib/image.py", line 182, in make_image
   x = self.to_rgba(self._A, self._alpha)
File "/usr/lib/pymodules/python2.5/matplotlib/cm.py", line 166, in to_rgba
   x = self.norm(x)
File "/usr/lib/pymodules/python2.5/matplotlib/colors.py", line 763, in __call__
   elif vmin==vmax:
File "/usr/lib/python2.5/site-packages/numpy/ma/core.py", line 3119, in __eq__
   check._mask = mask
AttributeError: 'numpy.bool_' object has no attribute '_mask'

-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (901, 'unstable'), (900, 'testing'), (300, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.31-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-matplotlib depends on:
ii libatk1.0-0 1.28.0-1 The ATK accessibility toolkit
ii libc6 2.10.2-5 Embedded GNU C Library: Shared lib
ii libcairo2 1.8.8-2 The Cairo 2D vector graphics libra
ii libfontconfig1 2.8.0-2 generic font configuration library
ii libfreetype6 2.3.11-1 FreeType 2 font engine, shared lib
ii libgcc1 1:4.4.2-2 GCC support library
ii libglib2.0-0 2.22.4-1 The GLib library of C routines
ii libgtk2.0-0 2.18.6-1 The GTK+ graphical user interface
ii libpango1.0-0 1.26.0-1 Layout and rendering of internatio
ii libpng12-0 1.2.40-1 PNG library - runtime
ii libstdc++6 4.4.2-2 The GNU Standard C++ Library v3
ii python 2.5.4-9 An interactive high-level object-o
ii python-cairo 1.8.6-1 Python bindings for the Cairo vect
ii python-dateutil 1.4.1-3 powerful extensions to the standar
ii python-gobject 2.16.1-1 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 1.5.2-1 Python parsing module
ii python-support 1.0.6.1 automated rebuilding support for P
ii python-tz 2009l-1 Python version of the Olson timezo
ii tcl8.5 8.5.7-1 Tcl (the Tool Command Language) v8
ii tk8.5 8.5.7-1 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 2.16.0-1 GTK+ bindings: Glade support
ii python-tk 2.5.2-1.1 Tkinter - Writing Tk applications

Versions of packages python-matplotlib suggests:
ii dvipng 1.11-1 convert DVI files to PNG graphics
ii ipython 0.10-1 enhanced interactive Python shell
ii librsvg2-common 2.26.0-1 SAX-based renderer library for SVG
ii python-configobj 4.5.2-2 a simple but powerful config file
pn python-excelerator <none> (no description available)
ii python-gtk2 2.16.0-1 Python bindings for the GTK+ widge
ii python-matplotlib-doc 0.99.0-1 Python based plotting system (docu
pn python-qt3 <none> (no description available)
ii python-qt4 4.6-1 Python bindings for Qt4
ii python-scipy 0.7.0-2+b1 scientific tools for Python
ii python-traits 3.2.0-1 Manifest typing and reactive progr
ii python-wxgtk2.8 2.8.10.1-3 wxWidgets Cross-platform C++ GUI t
ii texlive-extra-utils 2007.dfsg.2-7 TeX Live: TeX auxiliary programs
ii texlive-latex-extra 2007.dfsg.17-2 TeX Live: LaTeX supplementary pack

-- no debconf information

_______________________________________________
Python-modules-team mailing list
Python-modules-team@...633...
http://lists.alioth.debian.org/mailman/listinfo/python-modules-team