How to convert list of numpy arrays into single numpy array?

Question

Suppose I have ;

LIST = [[array([1, 2, 3, 4, 5]), array([1, 2, 3, 4, 5],[1,2,3,4,5])] # inner lists are numpy arrays

I try to convert;

array([[1, 2, 3, 4, 5],
       [1, 2, 3, 4, 5],
       [1, 2, 3, 4, 5])

I am solving it by iteration on vstack right now but it is really slow for especially large LIST

What do you suggest for the best efficient way?

LIST = [[array([1, 2, 3, 4, 5]), array([1, 2, 3, 4, 5],[1,2,3,4,5])] this is not correct python syntax. Please clarify. — Marcin, 19 hours ago

jez · Accepted Answer · 2014-12-17 01:25:33Z

up vote 2 down vote accepted

This should do it:

numpy.concatenate( LIST, axis=0 )

answered 19 hours ago

jez
1,445110

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