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    Does it need to be a numpy array before it is finished? If not, use a list of lists and then convert when you're finished. Commented Aug 20, 2011 at 20:11
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    @AndrewJaffe Do lists of lists match the memory efficiency of numpy? Commented Jun 16, 2015 at 16:01
  • There's another method using list of numpy array and np.concatenate Commented Oct 25, 2021 at 0:59