I'm having a problem I haven't seen elsewhere (and apologies if it has been answered before). I see the following behavior (copied verbatim from a python session): Python 2.7.4 (default, Apr 6 2013, 19:55:15) [MSC v.1500 64 bit (AMD64)] on win32Type "help", "copyright", "credits" or "license" for more information.>>> import numpy as np>>> x=[[np.zeros(10)] for i in range(10)]>>> x.index(x[0])0>>> x.index(x[1])Traceback (most recent call last): File "", line 1, in ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()>>> x[1].append(np.zeros(10))>>> x.index(x[1])1 Any ideas why I see a ValueError when trying to find the index of a list containing a single ndarray? -Matt -- View this message in context: http://numpy-discussion.10968.n7.nabble.com/List-of-arrays-failing-index-rem... Sent from the Numpy-discussion mailing list archive at Nabble.com.