Aha, the unnecessary copy mentioned in the https://dbs.ifi.uni-heidelberg.de/files/Team/eschubert/publications/SSDBM18-covariance-authorcopy.pdf. paper is a copy of the input. Here it is about discarding a valuable output (the mean) and then calculating that result separately.
Not throwing the mean away saves about 20% computation time. Or phrased differently the calculation of the variance spends about a 25% of the computation time on calculating the mean. _______________________________________________ NumPy-Discussion mailing list -- numpy-discussion@python.org To unsubscribe send an email to numpy-discussion-le...@python.org https://mail.python.org/mailman3/lists/numpy-discussion.python.org/ Member address: arch...@mail-archive.com
