DEP: Deprecate incorrect behavior of expand_dims. #9133
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Expand_dims works as documented when the index of the inserted NewAxis in the resulting array satisfies -a.ndim - 1 <= index <= a.ndim. However, when index > a.ndim index is replaced by a.ndim and, when index < -a.ndim - 1, it is replaced by index + a.ndim + 1, which may be negative and results in incorrect placement. The latter two cases are now deprecated. Closes numpy#9100.
charris
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08 - Backport
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Expand_dims works as documented when the index of the inserted NewAxis
in the resulting array satisfies
-a.ndim - 1 <= index <= a.ndim.However, when
index > a.ndim, index is replaced bya.ndimand, whenindex < -a.ndim - 1, it is replaced byindex + a.ndim + 1, which may benegative and results in incorrect placement. The latter two cases are
now deprecated.
Closes #9100.