Set operations in Numeric

[Robert Kern]

George Sakkis wrote:
> Is there a way to handle numeric (or numarray or numpy) arrays as sets
> and compute efficiently their intersection, union, etc. ? I hope there
> is a faster way than s = array(set(A) & set(B)). Can this be done with
> masked arrays maybe ? I've never used them though and browsing through
> the docs didn't make clear if it is possible.

You'll probably want to ask such questions on the numpy list:

   http://www.scipy.org/Mailing_Lists

Robert Cimrman has implemented a number of set operations based on sorting.

   http://svn.scipy.org/svn/scipy/trunk/Lib/sandbox/arraysetops/arraysetops.py

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco