On Mo, 2015-01-05 at 14:13 +0530, Maniteja Nandana wrote: > Hi Anthony, > > > I am not sure whether the following section in documentation is > relevant to the behavior you were referring to. > > > When an ellipsis (...) is present but has no size (i.e. replaces > zero :) the result will still always be an array. A view if no > advanced index is present, otherwise a copy. >
Exactly. There are actually three forms of indexing to distinguish. 1. Indexing with integers (also scalar arrays) matching the number of dimensions. This will return a *scalar*. 2. Slicing, etc. which returns a view. This also occurs as soon there is an ellipsis in there (even if it replaces 0 `:`). You should see it as a feature to get a view if the result might be a scalar otherwise ;)! 3. Advanced indexing which cannot be view based and returns a copy. - Sebastian > Here, ...replaces zero : > > > > Advanced indexing always returns a copy of the data (contrast with > basic slicing that returns a view). > And I think it is a view that is returned in this case. > > > >>> a = array([1]) > >>>a > array([1]) > >>>a[:,0] # zero : are present > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > IndexError: too many indices for array > >>>a[...,0]=2 > >>>a > array([2]) > >>>a[0] = 3 > >>>a > array([3]) > >>>a[(0,)] = 4 > >>>a > array([4]) > >>>a[: > array([1]) > > > Hope I helped. > > > Cheers, > N.Maniteja. > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion
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