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Diffstat (limited to 'doc/source/reference/arrays.indexing.rst')
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diff --git a/doc/source/reference/arrays.indexing.rst b/doc/source/reference/arrays.indexing.rst index 3a319ecca..0c0c8dff6 100644 --- a/doc/source/reference/arrays.indexing.rst +++ b/doc/source/reference/arrays.indexing.rst @@ -57,6 +57,17 @@ interpreted as counting from the end of the array (*i.e.*, if All arrays generated by basic slicing are always :term:`views <view>` of the original array. +.. note:: + + NumPy slicing creates a :term:`view` instead of a copy as in the case of + builtin Python sequences such as string, tuple and list. + Care must be taken when extracting + a small portion from a large array which becomes useless after the + extraction, because the small portion extracted contains a reference + to the large original array whose memory will not be released until + all arrays derived from it are garbage-collected. In such cases an + explicit ``copy()`` is recommended. + The standard rules of sequence slicing apply to basic slicing on a per-dimension basis (including using a step index). Some useful concepts to remember include: |