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| author | Pauli Virtanen <pav@iki.fi> | 2016-09-11 19:30:25 +0200 |
|---|---|---|
| committer | Pauli Virtanen <pav@iki.fi> | 2017-01-19 22:12:47 +0100 |
| commit | f55932a21849d230b39f7f5ced354863756bf6d5 (patch) | |
| tree | e6ee49c4ff944b9b96ec238c794fbb2487d622ab /doc/source/reference | |
| parent | 0bff7b30466b26963cf4fc1b280eb207b74e9851 (diff) | |
| download | numpy-f55932a21849d230b39f7f5ced354863756bf6d5.tar.gz | |
BUG: umath: in reduceat, arrays must be copied on overlap even if they are the same
Diffstat (limited to 'doc/source/reference')
| -rw-r--r-- | doc/source/reference/c-api.iterator.rst | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/doc/source/reference/c-api.iterator.rst b/doc/source/reference/c-api.iterator.rst index b5d00f4be..5761e56c2 100644 --- a/doc/source/reference/c-api.iterator.rst +++ b/doc/source/reference/c-api.iterator.rst @@ -474,7 +474,8 @@ Construction and Destruction via *different* index/dtype/shape combinations. - In particular, unless the arrays have the same shape, dtype, - strides, and start address, any shared common data byte accessible + strides, start address, and NPY_ITER_OVERLAP_NOT_SAME is not specified, + any shared common data byte accessible by indexing implies overlap. Because exact overlap detection has exponential runtime @@ -618,6 +619,15 @@ Construction and Destruction returns true from the corresponding element in the ARRAYMASK operand. + .. c:var:: NPY_ITER_OVERLAP_NOT_SAME + + In the memory overlap checks done when ``NPY_ITER_COPY_IF_OVERLAP`` + is specified, consider this array as overlapping even if it is + exactly the same as another array. + + This flag should be set on arrays that are not accessed in the + iterator order. + .. c:function:: NpyIter* NpyIter_AdvancedNew(npy_intp nop, PyArrayObject** op, npy_uint32 flags, NPY_ORDER order, NPY_CASTING casting, npy_uint32* op_flags, PyArray_Descr** op_dtypes, int oa_ndim, int** op_axes, npy_intp* itershape, npy_intp buffersize) Extends :c:func:`NpyIter_MultiNew` with several advanced options providing |