[Numpy-discussion] Slow conversion from list to arrays

Nadav Horesh nadavh at VisionSense.com
Thu Dec 25 00:31:01 CST 2003


The conversion for a list of large arrays into a matrix is very slow in
numarray while reasonably fast:

>>> from numarray import *
>>> a = [arange(200000), arange(200000), arange(200000), arange(200000)]
>>> aa = array(a)   # Very slow

--------------------------------

>>> from Numeric import *
>>> a = [arange(200000), arange(200000), arange(200000), arange(200000)]
>>> aa = array(a)   # Fast

Python version:    2.3.3
numarray version:  Official 0.8

Tested under WinXP and RH9 linux.

Any workaround?

  Nadav







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