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Answer 1

A:

Install libpng. The 14 I believe refers to the current version 1.4.

EDITS

I would rebuild matplotlib from source again. When you run:

python setup.py build

pay close attention to the start of the output and make sure it finds the libraries it needs. For instance on my box:

basedirlist is: ['/usr/local', '/usr']
============================================================================
BUILDING MATPLOTLIB
            matplotlib: 1.0.0
                python: 2.5.4 (r254:67916, Oct 21 2009, 11:00:55)  [GCC
                        4.3.2]
              platform: linux2

REQUIRED DEPENDENCIES
                 numpy: 1.3.0
             freetype2: 9.20.3

OPTIONAL BACKEND DEPENDENCIES
                libpng: 1.2.36  ## what does yours say?
               Tkinter: Tkinter: 67737, Tk: 8.4, Tcl: 8.4
              wxPython: 2.8.10.1
                        * WxAgg extension not required for wxPython >= 2.8
                  Gtk+: gtk+: 2.16.1, glib: 2.22.4, pygtk: 2.14.1,
                        pygobject: 2.20.0
       Mac OS X native: no
                    Qt: no
                   Qt4: Qt: 4.5.1, PyQt4: 4.5.4
                 Cairo: 1.8.2

OPTIONAL DATE/TIMEZONE DEPENDENCIES
              datetime: present, version unknown
              dateutil: matplotlib will provide
                  pytz: 2009r

OPTIONAL USETEX DEPENDENCIES
                dvipng: no
           ghostscript: 8.64
                 latex: no
               pdftops: 0.10.7

Mark 2010-07-26 00:40:33

Thanks for replies!I believe I've already install libpng.The following was done:Downloaded version 1.4.3 =>tar -xvzf libpng-1.4.3.tar.gz =>cd libpng-1.4.3 =>./configure =>make =>make installShouldn't this be sufficient or are there some additional steps required?

Bjorkman 2010-07-26 13:44:04

@Bjorkman, you should really try and install through your system's package manager. That said, did your compile produce the libpng14.so? If it did, did the make install put in on path (probably /usr/local/lib)? What is the output of "find /usr/lib/ -name libpng*" and "find /usr/local/lib/ -name libpng*"?

Mark 2010-07-26 13:52:17

Looks like the libpng14.so is located in /usr/local/lib/lu@SilverBeauty:~$ find /usr/lib/ -name libpng*/usr/lib/vmware/lib/libpng12.so.0/usr/lib/vmware/lib/libpng12.so.0/libpng12.so.0..truncatedlu@SilverBeauty:~$ find /usr/local/lib/ -name libpng*/usr/local/lib/libpng14.la/usr/local/lib/libpng14.so.14/usr/local/lib/libpng14.so/usr/local/lib/libpng.so/usr/local/lib/libpng14.a/usr/local/lib/libpng.a/usr/local/lib/pkgconfig/libpng.pc/usr/local/lib/pkgconfig/libpng14.pc/usr/local/lib/libpng14.so.14.3.0/usr/local/lib/libpng.la

Bjorkman 2010-07-26 14:30:18

I may mention that I have one version of python 2.6 installed by means of the package manager. By running Ipython on this I can get the matplotlib work correctly. The reason why I'm interested to get it work under Python 2.5 is that I'm testing out ompc (a matlab to python compiler) and this only supports 2.5

Bjorkman 2010-07-26 14:31:13

@Bjorkeman, very confusing, did you build matplotlib from source as well? If you did, it should have picked up the libpng version 1.2 you have installed in /usr/lib.

Mark 2010-07-26 16:21:56

Yes, the failing matplotlib was built from source. Here are the detailed steps:matplotlib:sudo apt-get install python-matplotlibThis unfortunately installed into Python 2.6, which isn't compatible with the ompc.Works great when using: ipython -pylab (from console)In order to get it recognised by the Python 2.5 version:A manual download from sourceforge to ompc/matplotlib and-gunzip matplotlib-1.0.0.tar.gz -tar xvf matplotlib-1.0.0.tar -cd matplotlib-1.0.0/-sudo python setup.py installThen got following error message:ft2build.h: No such file or directory

Bjorkman 2010-07-26 20:41:47

[cont] This is due to missing freetype:downloaded ~/ompc/freetype-2.4.1 and installed with ./configure [options] make make install (as root)Also need libpng-1.4.3: tar -xvzf libpng-1.4.3.tar.gz (which in turn needs zlib: sudo apt-get install zlib1g-dev) cd libpng-1.4.3./configuremakemake install

Bjorkman 2010-07-26 20:42:42

Hmm, I'm running out of idea, see edits to my answer above, too many comments.

Mark 2010-07-26 22:36:47

Thanks Mark, I really appreciated your effort. I rebuilt the matplotlib as you suggested and the result is added to edits above. After a new install the initial error message still retains.

Bjorkman 2010-07-26 23:02:06

Answer 2

A:

I'm having exactly the same problem, tried using python2.5 and python2.7.

Alex 2010-07-27 22:21:17

Answer 3

+2 A:

You should check your LD_LIBRARY_PATH environnment variable and check that your libpng is in it.

The problem reported by python is a problem of dynamic loading : Nothing to see with the recompilation of matplotlib.

So :

Find the location of libpng.14.so with :

$> locate libpng.14.so

Note that the file must have the exact name so you may have to create a symbolic link if for example you have libpng.14.so.0 or something like that (Usually the symbolic links are automatically created when you install your lib

If you don't have any libpng.14.so.something or libpng.14.so, you may need to reinstall libpng 1.4 (with your package manager or directly from the sources)
Check $LD_LIBRARY_PATH. Change it if you need with :

$> export LD_LIBRARY_PATH=anewDir:$LD_LIBRARY_PATH

Elenaher 2010-07-29 08:50:57

Thanks ELenaher! This tip finally made me able to perform the import of pyplot. The LD_LIBRARY_PATH was empty but now contains the path to usr/local/lib. I read somewhere that it was not recommended to modify this variable? There are however still some issues: Running the plot command now renders a plot on the screen, but it is not possible to fill it with something meaningful. I guess this could be related to installing of Tkinter? I think I'll stick to my working Ipython version for now, and continue my experimenting with OMPC when it supports python 2.6.

Bjorkman 2010-07-29 19:45:59

ansaurus

tags:

views:

answers:

import matplotlib._png fails

basedirlist is: ['/usr/local', '/usr']

[Edit setup.cfg to suppress the above messages]

basedirlist is: ['/usr/local', '/usr']

[Edit setup.cfg to suppress the above messages]

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