On Sat, May 29, 2010 at 2:49 PM, Anne Archibald <aarch...@physics.mcgill.ca> wrote: > On 29 May 2010 15:09, Robert Kern <robert.k...@gmail.com> wrote: >> On Sat, May 29, 2010 at 12:27, Keith Goodman <kwgood...@gmail.com> wrote: >>> Will making changes to arr2 never change arr1 if >>> >>> arr2 = arr1[np.ix_(*lists)] >>> >>> where lists is a list of (index) lists? np.ix_ returns a tuple of >>> arrays so I'm guessing (and hoping) the answer is yes. >> >> Correct. > > To expand: any time you do fancy indexing - that is, index by anything > but a tuple of integers or slice objects - you get back a copy.
I have never seen such a simple and clear definition of the line between regular and fancy indexing. To make sure I understand I'll try to expand. Is the following right? Regular indexing (no copy made): int float bool slice tuple of any combination of the above Fancy indexing (copy made): Any indexing that is not regular indexing _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
