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DOC: Add note about <ufunc>.reduce evaluation order

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1 parent 98ccad6 commit 900d82ecd42932fc62c080341f8c918c9e1125b7 @mwiebe mwiebe committed Aug 31, 2011
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  1. +6 −0 doc/release/2.0.0-notes.rst
6 doc/release/2.0.0-notes.rst
@@ -110,6 +110,12 @@ functions more consistent with NumPy's general approach of taking views
where possible, and performs much faster as well. This has the
potential to break code that assumes a copy is made instead of a view.
+The <ufunc>.reduce functions evaluates some reductions in a different
+order than in previous versions of NumPy, generally providing higher
+performance. Because of the nature of floating-point arithmetic, this
+may subtly change some results, just as linking NumPy to a different
+BLAS implementations such as MKL can.
The function np.concatenate tries to match the layout of its input
arrays. Previously, the layout did not follow any particular reason,
and depended in an undesirable way on the particular axis chosen for

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