[Numpy-discussion] New functions.
Charles R Harris
charlesr.harris at gmail.com
Tue May 31 21:26:51 EDT 2011
On Tue, May 31, 2011 at 7:18 PM, Warren Weckesser <
warren.weckesser at enthought.com> wrote:
> On Tue, May 31, 2011 at 8:08 PM, Charles R Harris <
> charlesr.harris at gmail.com> wrote:
>> Hi All,
>> I've been contemplating new functions that could be added to numpy and
>> thought I'd run them by folks to see if there is any interest.
>> 1) Modified sort/argsort functions that return the maximum k values.
>> This is easy to do with heapsort and almost as easy with mergesort.
> While you're at, how about a function that finds both the max and min in
> one pass? (Mentioned previously in this thread:
What should it be called? minmax?
This also brings suggests a function that returns both mean and standard
deviation, something that could also be implemented using a more stable
algorithm than the current one.
> 2) Ufunc fadd (nanadd?) Treats nan as zero in addition. Should make a
>> faster version of nansum possible.
>> 3) Fast medians.
Other suggestions are welcome. Most of these are of the low hanging fruit
variety and shouldn't be too much work.
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