On Thu, Dec 12, 2019 at 4:39 PM Steven D'Aprano <st...@pearwood.info> wrote:
> > Surely a zero-dimensional array ought to have no elements at all? > nope -- a zero-dimensional array is a scalar -- as distinct from a 1-d (or 2-d, or n-d) array that happens to have only one element. in fact, numpy has a confusing (at least to me) distinction between a 0-D array and a scalar, but that's an implementation detail :-) In [2]: import numpy as np In [3]: # a 3D array In [5]: arr3 = np.ones((2,3,4)) In [6]: arr3.shape Out[6]: (2, 3, 4) In [7]: # index into it yields a 2D array In [8]: arr2 = arr3[1] In [9]: arr2.shape Out[9]: (3, 4) In [10]: # index into it yields a 1D array In [11]: arr1 = arr2[1] In [12]: arr1.shape Out[12]: (4,) In [13]: # index into it yields a 0D array In [14]: arr0 = arr1[0] In [15]: arr0.shape Out[15]: () -CHB - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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