Re: [Matplotlib-users] import error with numpy

[Eric F. <ef...@ha...>]

Chris,

On my machine, with latest svn numpy and cvs mpl, I don't get an import 
error. My numerix/fft/__init__.py looks like this:


from matplotlib.numerix import which

if which[0] == "numarray":
     from numarray.fft import *
elif which[0] == "numeric":
     from FFT import *
elif which[0] == "numpy":
     from numpy.dft import *
else:
     raise RuntimeError("invalid numerix selector")


This is quite different from what you describe, so I think your mpl, and 
maybe numpy, are not quite up-to-date.  Numpy and its mpl support are 
still evolving rapidly in tandem.

Eric

Christopher Fonnesbeck wrote:
> Using matplotlib from cvs with numpy still gives an fft import error:
> 
> In [1]: import pylab
> ------------------------------------------------------------------------ 
> ---
> exceptions.ImportError                               Traceback (most  
> recent call last)
> 
> /Users/chris/<ipython console>
> 
> /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
> packages/matplotlib-0.86.1-py2.4-macosx-10.4-ppc.egg/pylab.py
> ----> 1 from matplotlib.pylab import *
>         global matplotlib.pylab = undefined
> 
> /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
> packages/matplotlib-0.86.1-py2.4-macosx-10.4-ppc.egg/matplotlib/pylab.py
>     194 import cm
>     195 import _pylab_helpers
> --> 196 import mlab  #so I can override hist, psd, etc...
>         mlab = undefined
>     197
>     198 from axes import Axes, PolarAxes
> 
> /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- 
> packages/matplotlib-0.86.1-py2.4-macosx-10.4-ppc.egg/matplotlib/mlab.py
>      72
>      73 from numerix.mlab import hanning, cov, diff, svd, rand, std
> ---> 74 from numerix.fft import fft, inverse_fft
>         numerix.fft = undefined
>         fft = None
>         inverse_fft = undefined
>      75
>      76 from cbook import iterable
> 
> ImportError: cannot import name inverse_fft
> 
> 
> It turns out that the __init__.py file is not importing inverse_fft  
> (which is now ifft in numpy):
> 
> from matplotlib.numerix import which
> 
> if which[0] == "numarray":
>     from numarray.fft import *
> elif which[0] == "numeric":
>     from FFT import *
> elif which[0] == "numpy":
>     from numpy import fft
> else:
>     raise RuntimeError("invalid numerix selector")
> 
> You need to add:
> 
>     from numpy import ifft as inverse_fft
> 
> C.
> 
> -- 
> Christopher J. Fonnesbeck
> 
> Population Ecologist, Marine Mammal Section
> Fish & Wildlife Research Institute (FWC)
> St. Petersburg, FL
> 
> Adjunct Assistant Professor
> Warnell School of Forest Resources
> University of Georgia
> Athens, GA
> 
> T: 727.235.5570
> E: chris at trichech.us
> 
>