[pymvpa] error when running example script - projections.py

[Meng Liang]

Dear all,
Another question: when I tried to run the example script (projections.py in \doc\examples), I got the following error:
Traceback (most recent call last):  File "D:\data\Software\python\pymvpa_0.4.4\pymvpa-0.4.4\doc\examples\projections.py", line 16, in <module>    from mvpa.mappers.pca import PCAMapper  File "C:\Python25\Lib\site-packages\mvpa\mappers\pca.py", line 20, in <module>    if externals.exists('mdp', raiseException=True):  File "C:\Python25\Lib\site-packages\mvpa\base\externals.py", line 455, in exists    raise RuntimeError, "Required external '%s' was not found" % depRuntimeError: Required external 'mdp' was not found
Any advice? Many thanks!
Meng 		 	   		  
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