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| author | Pauli Virtanen <pav@iki.fi> | 2009-11-09 23:31:08 +0000 |
|---|---|---|
| committer | Pauli Virtanen <pav@iki.fi> | 2009-11-09 23:31:08 +0000 |
| commit | 869b208ddbf83c8b3aa915532368fdf0c289b351 (patch) | |
| tree | 1c535f6d63ad1ae5b393285df2cd030c43af5244 | |
| parent | d683bd8102010640184f0da458cb27ca5b2ad224 (diff) | |
| download | numpy-869b208ddbf83c8b3aa915532368fdf0c289b351.tar.gz | |
doc/release: add information about arraysetops changes (from Neil Crighton)
| -rw-r--r-- | doc/release/1.4.0-notes.rst | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/doc/release/1.4.0-notes.rst b/doc/release/1.4.0-notes.rst index 72daaf495..78bbc0fea 100644 --- a/doc/release/1.4.0-notes.rst +++ b/doc/release/1.4.0-notes.rst @@ -106,11 +106,26 @@ not possible to easily link against this library: in 1.4.0, support has been added to numpy.distutils so that 3rd party can reuse this library. See coremath documentation for more information. +Improved set operations +~~~~~~~~~~~~~~~~~~~~~~~ + +In previous versions of NumPy some set functions (intersect1d, +setxor1d, setdiff1d and setmember1d) could return incorrect results if +the input arrays contained duplicate items. These now work correctly +for input arrays with duplicates. setmember1d has been renamed to +in1d, as with the change to accept arrays with duplicates it is +no longer a set operation, and is conceptually similar to an +elementwise version of the Python operator 'in'. All of these +functions now accept the boolean keyword assume_unique. This is False +by default, but can be set True if the input arrays are known not +to contain duplicates, which can increase the functions' execution +speed. + Improvements ============ #. numpy import is noticeably faster (from 20 to 30 % depending on the - platform and computer) + platform and computer) #. The sort functions now sort nans to the end. @@ -136,6 +151,15 @@ The following functions are deprecated: old behavior will be removed in NumPy 1.5, and raises a DeprecationWarning in 1.4. + #. unique1d: use unique instead. unique1d raises a deprecation + warning in 1.4, and will be removed in 1.5. + + #. intersect1d_nu: use intersect1d instead. intersect1d_nu raises + a deprecation warning in 1.4, and will be removed in 1.5. + + #. setmember1d: use in1d instead. setmember1d raises a deprecation + warning in 1.4, and will be removed in 1.5. + The following raise errors: #. When operating on 0-d arrays, ``numpy.max`` and other functions accept |