matplotlib-users Mailing List for matplotlib

Hello:
 
I am new to Matplotlib. I have my data organized in three columns: x,y,z. x and y represents the coordinates of a point and z is the elevation at that point. I want to create a chart that has on y axis the elevation and on x axis the distance between the coordinates of the points. The chart displays a line that passes all the points, and if is possible interpolate between the elevation points
 
Can somebody give me an example?
 
Thank you in advance,
 
Ionut
 
 ____________________________________________________________________________________
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The replies have been helpful, but I'm still trying to figure out where 
the problem lies, but I have noticed that matplotlib-0.90.1 apparently 
doesn't use ttconv. I have this version installed at home and am able to 
generate poscript without a problem. Are you able to tell which package 
is complaining about the undefined symbol(s)?
If I downgrade (at work) I will probably lose some capabilities, since 
the file size of 0.91.2 is more than twice that of 0.90.1 (!) But I 
would prefer to be able to generate .ps or .eps, even if I lose the 
capability of using LaTeX for plot labels, e.g.
Best wishes,
Arthur
-------------------------------
amg -at- iri -dot- columbia -dot- edu
Johann Cohen-Tanugi wrote:
> Sorry for the preceding mis-threaded version. Here it is again :
> 
> I dont know if it is related, but I am actually failing an exemple :
> [cohen@jarrett matplotlib]$ ipython examples/pstest.py
> ---------------------------------------------------------------------------
> ImportError Traceback (most recent call last)
> 
> /home/cohen/data1/sources/python/matplotlib-svn/matplotlib/examples/pstest.py 
> in <module>()
> 2 import matplotlib
> 3 matplotlib.use('PS')
> ----> 4 from pylab import *
> 5
> 6 def f(t):
> 
> /usr/lib/python2.5/site-packages/pylab.py in <module>()
> ----> 1
> 2
> 3 from matplotlib.pylab import *
> 4 import matplotlib.pylab
> 5 __doc__ = matplotlib.pylab.__doc__
> 
> /usr/lib/python2.5/site-packages/matplotlib/pylab.py in <module>()
> 201 from numpy import ma
> 202
> --> 203 from matplotlib import mpl # pulls in most modules
> 204
> 205 # catch more than an import error here, since the src could fail 
> too,
> 
> /usr/lib/python2.5/site-packages/matplotlib/mpl.py in <module>()
> 1
> ----> 2 from matplotlib import artist
> 3 from matplotlib import axis
> 4 from matplotlib import axes
> 5 from matplotlib import cbook
> 6 from matplotlib import collections
> 
> /usr/lib/python2.5/site-packages/matplotlib/axis.py in <module>()
> 12 from ticker import NullLocator, FixedLocator, AutoLocator
> 13
> ---> 14 from font_manager import FontProperties
> 15 from text import Text, TextWithDash
> 16 from transforms import Affine2D, Bbox, blended_transform_factory, \
> 
> /usr/lib/python2.5/site-packages/matplotlib/font_manager.py in <module>()
> 38 import matplotlib
> 39 from matplotlib import afm
> ---> 40 from matplotlib import ft2font
> 41 from matplotlib import rcParams, get_configdir
> 42 from matplotlib.cbook import is_string_like
> 
> ImportError: /usr/lib/python2.5/site-packages/matplotlib/ft2font.so: 
> undefined symbol: inflateReset
> 
> My config is :
> ============================================================================
> BUILDING MATPLOTLIB
> matplotlib: 0.98pre
> python: 2.5.1 (r251:54863, Oct 30 2007, 13:54:11) [GCC
> 4.1.2 20070925 (Red Hat 4.1.2-33)]
> platform: linux2
> 
> REQUIRED DEPENDENCIES
> numpy: 1.1.0.dev5077
> freetype2: 9.16.3
> 
> OPTIONAL BACKEND DEPENDENCIES
> libpng: 1.2.22
> Tkinter: Tkinter: 50704, Tk: 8.4, Tcl: 8.4
> wxPython: 2.8.4.0
> * WxAgg extension not required for wxPython >= 2.8
> Gtk+: gtk+: 2.12.5, glib: 2.14.6, pygtk: 2.12.0,
> pygobject: 2.14.0
> Qt: Qt: 3.3.8, PyQt: 3.17.4
> Qt4: Qt: 4.3.3, PyQt4: 4.3.3
> Cairo: 1.4.12
> 
> OPTIONAL DATE/TIMEZONE DEPENDENCIES
> datetime: present, version unknown
> dateutil: matplotlib will provide
> pytz: matplotlib will provide
> 
> OPTIONAL USETEX DEPENDENCIES
> dvipng: 1.5
> ghostscript: 8.61
> latex: 3.141592
> 
> EXPERIMENTAL CONFIG PACKAGE DEPENDENCIES
> configobj: matplotlib will provide
> enthought.traits: matplotlib will provide
> 
> best,
> Johann
> 
> 
> 
> Johann Cohen-Tanugi wrote:
>> hmm, I did not use matplotlib recently, but looking at the library, I 
>> would guess that I have the same issue :
>> [cohen@jarrett ~]$ ldd /usr/lib/python2.5/site-packages/matplotlib/ttconv.so
>> linux-gate.so.1 => (0x00110000)
>> libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0x001c1000)
>> libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00308000)
>> libm.so.6 => /lib/libm.so.6 (0x0011f000)
>> libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00148000)
>> libpthread.so.0 => /lib/libpthread.so.0 (0x00154000)
>> libc.so.6 => /lib/libc.so.6 (0x003f3000)
>> libdl.so.2 => /lib/libdl.so.2 (0x0016d000)
>> libutil.so.1 => /lib/libutil.so.1 (0x00172000)
>> /lib/ld-linux.so.2 (0x001a4000)
>> [cohen@jarrett ~]$ nm 
>> /usr/lib/python2.5/site-packages/matplotlib/ttconv.so | grep 
>> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>> U 
>> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE@@GLIBCXX_3.4
>>
>>
>> Arthur M. Greene wrote:
>> 
>>> Hello Matplotlib users,
>>>
>>> I'm having difficulty generating postscript, and receiving an error that 
>>> I'm guessing reflects a version conflict, but I'm not sure exactly which 
>>> version of what needs to be changed. If I generate a plot (backend is 
>>> QtAGG, so I get a window), then click on the save button, I get a dialog 
>>> saying:
>>>
>>> /path_to/matplotlib/ttconv.so: undefined symbol: 
>>> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>>>
>>> Alternatively, if I do
>>>
>>> import matplotlib; matplotlib.use('PS'); from pylab import *
>>>
>>> the result is as follows (essentially the same error):
>>>
>>> exceptions.ImportError
>>> Traceback (most recent call last)
>>>
>>> /home/amg/<ipython console>
>>>
>>> /home/amg/cdat4_1/lib/python2.4/site-packages/pylab.py
>>> ----> 1 from matplotlib.pylab import *
>>> 2 import matplotlib.pylab
>>> 3 __doc__ = matplotlib.pylab.__doc__
>>>
>>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pylab.py
>>> 290
>>> 291
>>> --> 292 from matplotlib.pyplot import *
>>> 293
>>> 294
>>>
>>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pyplot.py
>>> 35
>>> 36 from matplotlib.backends import pylab_setup
>>> ---> 37 new_figure_manager, draw_if_interactive, show = pylab_setup()
>>> 38
>>> 39 def switch_backend(newbackend):
>>>
>>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/__init__.py 
>>> in pylab_setup()
>>> 22 backend_name = 'backend_'+backend.lower()
>>> 23 backend_mod = __import__('matplotlib.backends.'+backend_name,
>>> ---> 24 globals(),locals(),[backend_name])
>>> 25
>>> 26 # Things we pull in from all backends
>>>
>>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py 
>>>
>>> 22 from matplotlib.font_manager import findfont, 		 
>>> is_opentype_cff_font
>>> 23 from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, 		 
>>> LOAD_NO_HINTING
>>> ---> 24 from matplotlib.ttconv import convert_ttf_to_ps
>>> 25 from matplotlib.mathtext import MathTextParser
>>> 26 from matplotlib._mathtext_data import uni2type1
>>>
>>> ImportError: 
>>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/ttconv.so: 
>>> undefined symbol: _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>>>
>>> (The above backtrace is from iPython, but I get the same thing running 
>>> from plain ol' Python.)
>>>
>>> Googling suggests that this might mean I have a version of Matplotlib 
>>> that is too recent for the g++ compiler on my system, but I'm not really 
>>> certain. I'm running as an unprivileged user on RHEL4, with most of the 
>>> necessary libraries already present on the system. I've only had to add 
>>> qt and PyQt, which are installed in my home directory, where Matplotlib 
>>> can apparently find them. Version info is as follows:
>>>
>>> These are locally installed:
>>> Python 2.4
>>> qt-3.3.8b
>>> PyQt-3.17.4
>>> Matplotlib-0.91.2
>>>
>>> The following were already present:
>>> Kernel: 2.6.9-67.0.1.ELsmp, on i686
>>> glibc-2.3.4-2.39
>>> gcc-3.4.6-9
>>> tcl-8.4.7-2
>>> tk-8.4.7-3.el4_6.1
>>> freetype-2.1.9-6.el4
>>> libpng-1.2.7-3.el4_5.1
>>> zlib-1.2.1.2-1.2
>>> ghostscript-7.07-33.2.el4_6.1
>>> Output of 'gs --version': 8.50
>>>
>>> I tried switching to qt4/PyQt4, but then ipython -pylab hangs...
>>>
>>> Not sure what other info to supply; suggestions appreciated.
>>>
>>> Thanks!
>>>
>>> Arthur
>>>

Sorry for the preceding mis-threaded version. Here it is again :
I dont know if it is related, but I am actually failing an exemple :
[cohen@jarrett matplotlib]$ ipython examples/pstest.py
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
/home/cohen/data1/sources/python/matplotlib-svn/matplotlib/examples/pstest.py 
in <module>()
 2 import matplotlib
 3 matplotlib.use('PS')
----> 4 from pylab import *
 5
 6 def f(t):
/usr/lib/python2.5/site-packages/pylab.py in <module>()
----> 1
 2
 3 from matplotlib.pylab import *
 4 import matplotlib.pylab
 5 __doc__ = matplotlib.pylab.__doc__
/usr/lib/python2.5/site-packages/matplotlib/pylab.py in <module>()
 201 from numpy import ma
 202
--> 203 from matplotlib import mpl # pulls in most modules
 204
 205 # catch more than an import error here, since the src could fail 
too,
/usr/lib/python2.5/site-packages/matplotlib/mpl.py in <module>()
 1
----> 2 from matplotlib import artist
 3 from matplotlib import axis
 4 from matplotlib import axes
 5 from matplotlib import cbook
 6 from matplotlib import collections
/usr/lib/python2.5/site-packages/matplotlib/axis.py in <module>()
 12 from ticker import NullLocator, FixedLocator, AutoLocator
 13
---> 14 from font_manager import FontProperties
 15 from text import Text, TextWithDash
 16 from transforms import Affine2D, Bbox, blended_transform_factory, \
/usr/lib/python2.5/site-packages/matplotlib/font_manager.py in <module>()
 38 import matplotlib
 39 from matplotlib import afm
---> 40 from matplotlib import ft2font
 41 from matplotlib import rcParams, get_configdir
 42 from matplotlib.cbook import is_string_like
ImportError: /usr/lib/python2.5/site-packages/matplotlib/ft2font.so: 
undefined symbol: inflateReset
My config is :
============================================================================
BUILDING MATPLOTLIB
 matplotlib: 0.98pre
 python: 2.5.1 (r251:54863, Oct 30 2007, 13:54:11) [GCC
 4.1.2 20070925 (Red Hat 4.1.2-33)]
 platform: linux2
REQUIRED DEPENDENCIES
 numpy: 1.1.0.dev5077
 freetype2: 9.16.3
OPTIONAL BACKEND DEPENDENCIES
 libpng: 1.2.22
 Tkinter: Tkinter: 50704, Tk: 8.4, Tcl: 8.4
 wxPython: 2.8.4.0
 * WxAgg extension not required for wxPython >= 2.8
 Gtk+: gtk+: 2.12.5, glib: 2.14.6, pygtk: 2.12.0,
 pygobject: 2.14.0
 Qt: Qt: 3.3.8, PyQt: 3.17.4
 Qt4: Qt: 4.3.3, PyQt4: 4.3.3
 Cairo: 1.4.12
OPTIONAL DATE/TIMEZONE DEPENDENCIES
 datetime: present, version unknown
 dateutil: matplotlib will provide
 pytz: matplotlib will provide
OPTIONAL USETEX DEPENDENCIES
 dvipng: 1.5
 ghostscript: 8.61
 latex: 3.141592
EXPERIMENTAL CONFIG PACKAGE DEPENDENCIES
 configobj: matplotlib will provide
 enthought.traits: matplotlib will provide
best,
Johann
Johann Cohen-Tanugi wrote:
> hmm, I did not use matplotlib recently, but looking at the library, I 
> would guess that I have the same issue :
> [cohen@jarrett ~]$ ldd /usr/lib/python2.5/site-packages/matplotlib/ttconv.so
> linux-gate.so.1 => (0x00110000)
> libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0x001c1000)
> libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00308000)
> libm.so.6 => /lib/libm.so.6 (0x0011f000)
> libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00148000)
> libpthread.so.0 => /lib/libpthread.so.0 (0x00154000)
> libc.so.6 => /lib/libc.so.6 (0x003f3000)
> libdl.so.2 => /lib/libdl.so.2 (0x0016d000)
> libutil.so.1 => /lib/libutil.so.1 (0x00172000)
> /lib/ld-linux.so.2 (0x001a4000)
> [cohen@jarrett ~]$ nm 
> /usr/lib/python2.5/site-packages/matplotlib/ttconv.so | grep 
> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
> U 
> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE@@GLIBCXX_3.4
>
>
> Arthur M. Greene wrote:
> 
>> Hello Matplotlib users,
>>
>> I'm having difficulty generating postscript, and receiving an error that 
>> I'm guessing reflects a version conflict, but I'm not sure exactly which 
>> version of what needs to be changed. If I generate a plot (backend is 
>> QtAGG, so I get a window), then click on the save button, I get a dialog 
>> saying:
>>
>> /path_to/matplotlib/ttconv.so: undefined symbol: 
>> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>>
>> Alternatively, if I do
>>
>> import matplotlib; matplotlib.use('PS'); from pylab import *
>>
>> the result is as follows (essentially the same error):
>>
>> exceptions.ImportError
>> Traceback (most recent call last)
>>
>> /home/amg/<ipython console>
>>
>> /home/amg/cdat4_1/lib/python2.4/site-packages/pylab.py
>> ----> 1 from matplotlib.pylab import *
>> 2 import matplotlib.pylab
>> 3 __doc__ = matplotlib.pylab.__doc__
>>
>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pylab.py
>> 290
>> 291
>> --> 292 from matplotlib.pyplot import *
>> 293
>> 294
>>
>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pyplot.py
>> 35
>> 36 from matplotlib.backends import pylab_setup
>> ---> 37 new_figure_manager, draw_if_interactive, show = pylab_setup()
>> 38
>> 39 def switch_backend(newbackend):
>>
>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/__init__.py 
>> in pylab_setup()
>> 22 backend_name = 'backend_'+backend.lower()
>> 23 backend_mod = __import__('matplotlib.backends.'+backend_name,
>> ---> 24 globals(),locals(),[backend_name])
>> 25
>> 26 # Things we pull in from all backends
>>
>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py 
>>
>> 22 from matplotlib.font_manager import findfont, 		 
>> is_opentype_cff_font
>> 23 from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, 		 
>> LOAD_NO_HINTING
>> ---> 24 from matplotlib.ttconv import convert_ttf_to_ps
>> 25 from matplotlib.mathtext import MathTextParser
>> 26 from matplotlib._mathtext_data import uni2type1
>>
>> ImportError: 
>> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/ttconv.so: 
>> undefined symbol: _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>>
>> (The above backtrace is from iPython, but I get the same thing running 
>> from plain ol' Python.)
>>
>> Googling suggests that this might mean I have a version of Matplotlib 
>> that is too recent for the g++ compiler on my system, but I'm not really 
>> certain. I'm running as an unprivileged user on RHEL4, with most of the 
>> necessary libraries already present on the system. I've only had to add 
>> qt and PyQt, which are installed in my home directory, where Matplotlib 
>> can apparently find them. Version info is as follows:
>>
>> These are locally installed:
>> Python 2.4
>> qt-3.3.8b
>> PyQt-3.17.4
>> Matplotlib-0.91.2
>>
>> The following were already present:
>> Kernel: 2.6.9-67.0.1.ELsmp, on i686
>> glibc-2.3.4-2.39
>> gcc-3.4.6-9
>> tcl-8.4.7-2
>> tk-8.4.7-3.el4_6.1
>> freetype-2.1.9-6.el4
>> libpng-1.2.7-3.el4_5.1
>> zlib-1.2.1.2-1.2
>> ghostscript-7.07-33.2.el4_6.1
>> Output of 'gs --version': 8.50
>>
>> I tried switching to qt4/PyQt4, but then ipython -pylab hangs...
>>
>> Not sure what other info to supply; suggestions appreciated.
>>
>> Thanks!
>>
>> Arthur
>>
>> -------------------------------
>> amg -at- iri -dot- columbia -dot- edu
>>
>> -------------------------------------------------------------------------
>> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference 
>> Don't miss this year's exciting event. There's still time to save 100ドル. 
>> Use priority code J8TL2D2. 
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>> _______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>> 
>> 
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference 
> Don't miss this year's exciting event. There's still time to save 100ドル. 
> Use priority code J8TL2D2. 
> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> 

I dont know if it is related, but I am actually failing an exemple :
[cohen@jarrett matplotlib]$ ipython examples/pstest.py
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
/home/cohen/data1/sources/python/matplotlib-svn/matplotlib/examples/pstest.py 
in <module>()
 2 import matplotlib
 3 matplotlib.use('PS')
----> 4 from pylab import *
 5
 6 def f(t):
/usr/lib/python2.5/site-packages/pylab.py in <module>()
----> 1
 2
 3 from matplotlib.pylab import *
 4 import matplotlib.pylab
 5 __doc__ = matplotlib.pylab.__doc__
/usr/lib/python2.5/site-packages/matplotlib/pylab.py in <module>()
 201 from numpy import ma
 202
--> 203 from matplotlib import mpl # pulls in most modules
 204
 205 # catch more than an import error here, since the src could fail 
too,
/usr/lib/python2.5/site-packages/matplotlib/mpl.py in <module>()
 1
----> 2 from matplotlib import artist
 3 from matplotlib import axis
 4 from matplotlib import axes
 5 from matplotlib import cbook
 6 from matplotlib import collections
/usr/lib/python2.5/site-packages/matplotlib/axis.py in <module>()
 12 from ticker import NullLocator, FixedLocator, AutoLocator
 13
---> 14 from font_manager import FontProperties
 15 from text import Text, TextWithDash
 16 from transforms import Affine2D, Bbox, blended_transform_factory, \
/usr/lib/python2.5/site-packages/matplotlib/font_manager.py in <module>()
 38 import matplotlib
 39 from matplotlib import afm
---> 40 from matplotlib import ft2font
 41 from matplotlib import rcParams, get_configdir
 42 from matplotlib.cbook import is_string_like
ImportError: /usr/lib/python2.5/site-packages/matplotlib/ft2font.so: 
undefined symbol: inflateReset
My config is :
============================================================================
BUILDING MATPLOTLIB
 matplotlib: 0.98pre
 python: 2.5.1 (r251:54863, Oct 30 2007, 13:54:11) [GCC
 4.1.2 20070925 (Red Hat 4.1.2-33)]
 platform: linux2
REQUIRED DEPENDENCIES
 numpy: 1.1.0.dev5077
 freetype2: 9.16.3
OPTIONAL BACKEND DEPENDENCIES
 libpng: 1.2.22
 Tkinter: Tkinter: 50704, Tk: 8.4, Tcl: 8.4
 wxPython: 2.8.4.0
 * WxAgg extension not required for wxPython >= 2.8
 Gtk+: gtk+: 2.12.5, glib: 2.14.6, pygtk: 2.12.0,
 pygobject: 2.14.0
 Qt: Qt: 3.3.8, PyQt: 3.17.4
 Qt4: Qt: 4.3.3, PyQt4: 4.3.3
 Cairo: 1.4.12
OPTIONAL DATE/TIMEZONE DEPENDENCIES
 datetime: present, version unknown
 dateutil: matplotlib will provide
 pytz: matplotlib will provide
OPTIONAL USETEX DEPENDENCIES
 dvipng: 1.5
 ghostscript: 8.61
 latex: 3.141592
EXPERIMENTAL CONFIG PACKAGE DEPENDENCIES
 configobj: matplotlib will provide
 enthought.traits: matplotlib will provide
best,
Johann

hmm, I did not use matplotlib recently, but looking at the library, I 
would guess that I have the same issue :
[cohen@jarrett ~]$ ldd /usr/lib/python2.5/site-packages/matplotlib/ttconv.so
 linux-gate.so.1 => (0x00110000)
 libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0x001c1000)
 libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00308000)
 libm.so.6 => /lib/libm.so.6 (0x0011f000)
 libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00148000)
 libpthread.so.0 => /lib/libpthread.so.0 (0x00154000)
 libc.so.6 => /lib/libc.so.6 (0x003f3000)
 libdl.so.2 => /lib/libdl.so.2 (0x0016d000)
 libutil.so.1 => /lib/libutil.so.1 (0x00172000)
 /lib/ld-linux.so.2 (0x001a4000)
[cohen@jarrett ~]$ nm 
/usr/lib/python2.5/site-packages/matplotlib/ttconv.so | grep 
_ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
 U 
_ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE@@GLIBCXX_3.4
Arthur M. Greene wrote:
> Hello Matplotlib users,
>
> I'm having difficulty generating postscript, and receiving an error that 
> I'm guessing reflects a version conflict, but I'm not sure exactly which 
> version of what needs to be changed. If I generate a plot (backend is 
> QtAGG, so I get a window), then click on the save button, I get a dialog 
> saying:
>
> /path_to/matplotlib/ttconv.so: undefined symbol: 
> _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>
> Alternatively, if I do
>
> import matplotlib; matplotlib.use('PS'); from pylab import *
>
> the result is as follows (essentially the same error):
>
> exceptions.ImportError
> Traceback (most recent call last)
>
> /home/amg/<ipython console>
>
> /home/amg/cdat4_1/lib/python2.4/site-packages/pylab.py
> ----> 1 from matplotlib.pylab import *
> 2 import matplotlib.pylab
> 3 __doc__ = matplotlib.pylab.__doc__
>
> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pylab.py
> 290
> 291
> --> 292 from matplotlib.pyplot import *
> 293
> 294
>
> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pyplot.py
> 35
> 36 from matplotlib.backends import pylab_setup
> ---> 37 new_figure_manager, draw_if_interactive, show = pylab_setup()
> 38
> 39 def switch_backend(newbackend):
>
> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/__init__.py 
> in pylab_setup()
> 22 backend_name = 'backend_'+backend.lower()
> 23 backend_mod = __import__('matplotlib.backends.'+backend_name,
> ---> 24 globals(),locals(),[backend_name])
> 25
> 26 # Things we pull in from all backends
>
> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py 
>
> 22 from matplotlib.font_manager import findfont, 		 
> is_opentype_cff_font
> 23 from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, 		 
> LOAD_NO_HINTING
> ---> 24 from matplotlib.ttconv import convert_ttf_to_ps
> 25 from matplotlib.mathtext import MathTextParser
> 26 from matplotlib._mathtext_data import uni2type1
>
> ImportError: 
> /home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/ttconv.so: 
> undefined symbol: _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
>
> (The above backtrace is from iPython, but I get the same thing running 
> from plain ol' Python.)
>
> Googling suggests that this might mean I have a version of Matplotlib 
> that is too recent for the g++ compiler on my system, but I'm not really 
> certain. I'm running as an unprivileged user on RHEL4, with most of the 
> necessary libraries already present on the system. I've only had to add 
> qt and PyQt, which are installed in my home directory, where Matplotlib 
> can apparently find them. Version info is as follows:
>
> These are locally installed:
> Python 2.4
> qt-3.3.8b
> PyQt-3.17.4
> Matplotlib-0.91.2
>
> The following were already present:
> Kernel: 2.6.9-67.0.1.ELsmp, on i686
> glibc-2.3.4-2.39
> gcc-3.4.6-9
> tcl-8.4.7-2
> tk-8.4.7-3.el4_6.1
> freetype-2.1.9-6.el4
> libpng-1.2.7-3.el4_5.1
> zlib-1.2.1.2-1.2
> ghostscript-7.07-33.2.el4_6.1
> Output of 'gs --version': 8.50
>
> I tried switching to qt4/PyQt4, but then ipython -pylab hangs...
>
> Not sure what other info to supply; suggestions appreciated.
>
> Thanks!
>
> Arthur
>
> -------------------------------
> amg -at- iri -dot- columbia -dot- edu
>
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> 

Hello Matplotlib users,
I'm having difficulty generating postscript, and receiving an error that 
I'm guessing reflects a version conflict, but I'm not sure exactly which 
version of what needs to be changed. If I generate a plot (backend is 
QtAGG, so I get a window), then click on the save button, I get a dialog 
saying:
/path_to/matplotlib/ttconv.so: undefined symbol: 
_ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
Alternatively, if I do
import matplotlib; matplotlib.use('PS'); from pylab import *
the result is as follows (essentially the same error):
exceptions.ImportError
Traceback (most recent call last)
/home/amg/<ipython console>
/home/amg/cdat4_1/lib/python2.4/site-packages/pylab.py
----> 1 from matplotlib.pylab import *
 2 import matplotlib.pylab
 3 __doc__ = matplotlib.pylab.__doc__
/home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pylab.py
 290
 291
--> 292 from matplotlib.pyplot import *
 293
 294
/home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/pyplot.py
 35
 36 from matplotlib.backends import pylab_setup
---> 37 new_figure_manager, draw_if_interactive, show = pylab_setup()
 38
 39 def switch_backend(newbackend):
/home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/__init__.py 
in pylab_setup()
 22 backend_name = 'backend_'+backend.lower()
 23 backend_mod = __import__('matplotlib.backends.'+backend_name,
---> 24 globals(),locals(),[backend_name])
 25
 26 # Things we pull in from all backends
/home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/backends/backend_ps.py 
 22 from matplotlib.font_manager import findfont, 		 
is_opentype_cff_font
 23 from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, 		 
LOAD_NO_HINTING
---> 24 from matplotlib.ttconv import convert_ttf_to_ps
 25 from matplotlib.mathtext import MathTextParser
 26 from matplotlib._mathtext_data import uni2type1
ImportError: 
/home/amg/cdat4_1/lib/python2.4/site-packages/matplotlib/ttconv.so: 
undefined symbol: _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE
(The above backtrace is from iPython, but I get the same thing running 
from plain ol' Python.)
Googling suggests that this might mean I have a version of Matplotlib 
that is too recent for the g++ compiler on my system, but I'm not really 
certain. I'm running as an unprivileged user on RHEL4, with most of the 
necessary libraries already present on the system. I've only had to add 
qt and PyQt, which are installed in my home directory, where Matplotlib 
can apparently find them. Version info is as follows:
These are locally installed:
Python 2.4
qt-3.3.8b
PyQt-3.17.4
Matplotlib-0.91.2
The following were already present:
Kernel: 2.6.9-67.0.1.ELsmp, on i686
glibc-2.3.4-2.39
gcc-3.4.6-9
tcl-8.4.7-2
tk-8.4.7-3.el4_6.1
freetype-2.1.9-6.el4
libpng-1.2.7-3.el4_5.1
zlib-1.2.1.2-1.2
ghostscript-7.07-33.2.el4_6.1
Output of 'gs --version': 8.50
I tried switching to qt4/PyQt4, but then ipython -pylab hangs...
Not sure what other info to supply; suggestions appreciated.
Thanks!
Arthur
-------------------------------
amg -at- iri -dot- columbia -dot- edu

Hi,
Thank you for pointing that out, that does indeed do what I want
mostly. However, while the data is autoscaled to the plot, the values
on the y axis are not updated and they remain at their original
values. I suspect this is because I am not giving a command to redraw
the axes. How would I go about doing that? I think I need to blit a
larger bbox that encompasses the axes as well, but I'm not sure how to
get that.
By the way, I found that self.ax1.autoscale_view(scalex=False, scaley
= True) seems to autoscale just the y axis and seems clearer than the
set_ylim code suggested below.
Thanks again,
Glenn
On 4/26/08, John Hunter <jd...@gm...> wrote:
> On Fri, Apr 25, 2008 at 1:19 AM, G Jones <gle...@gm...> wrote:
> > Hello,
> > Thank you for the suggestion. However, I am refering to the
> > canvas.restore_region, draw_artist, blit, gui_repaint sort of
> > animation.
> > Glenn
>
>
> His suggestion is still correct -- after you update the line data and
> before you call draw_artist, you can acll relim and autoscale_view as
> Mattias suggested. However, this will not always do what you want,
> because it will autoscale both the x and the y. In animated plots,
> often you are just updating the ydata an want to manually control the
> xlim and autoscale the ylim (eg strip charting). In that case, I
> would do :
>
> self.ax1.relim()
> self.ax1.set_ylim(*self.ax1.yaxis.major.locator.autoscale())
>
> JDH
>