Negative Feedback

Tag: errors

  • OpenModelica Mac OS X binaries

    If you are getting strange error messages when trying to run OMShell or other parts of the stuff that gets installed when you install OpenModelica from the Mac OS X .dmg, try using the .command files instead of the application files. This is discussed in the README.osx file.

    The error you will see is 

    basic_string::_S_construct NULL not valid

  • Matplotlib missing pylab

    I love matplotlib because it allowed me to move away from Matlab to Python as my platform of choice for quick problem solving. It is a very good plotting library. During my previous post on installing JModelica, I mentioned that matplotlib is failing. I recompiled a lot of stuff and finally thought I had it all licked (some of the problems had to do with gfortran not doing 64 bit code by default). Then I ran ipython, and import pylab fails. Strange, considering that import matplotlib works fine. Even stranger, ipython -pylab works fine, too.


    In [1]: import pylab
    ---------------------------------------------------------------------------
    ImportError                               Traceback (most recent call last)

    /Users/alchemyst/tmp/ in ()

    /Library/Python/2.6/site-packages/pylab.py in ()
    ----> 1 from matplotlib.pylab import *
        2 import matplotlib.pylab
        3 __doc__ = matplotlib.pylab.__doc__

    ImportError: No module named pylab
    After some very frustrating searching around and reading of forum posts, it finally dawns on me that I am in my tmp directory, where the matplotlib directory I built it is still around. So that’s what’s happening! import matplotlib is importing the module from this directory. There is no pylab module there, so it’s giving the error. Hopefully someone experiencing similar problems may find some help in this post.