Thanks! Tried it and it is about twice as fast as my approach. -Ning
On Wed, Jun 3, 2009 at 7:45 PM, <josef.p...@gmail.com> wrote: > On Wed, Jun 3, 2009 at 8:29 PM, Ning Sean <nings...@gmail.com> wrote: > > Hi, I want to extract elements of an array (say, a) that are contained in > > another array (say, b). That is, if a=array([1,1,2,3,3,4]), > b=array([1,4]), > > then I want array([1,1,4]). > > > > I did the following but the speed is very slow (maybe because a is very > > long): > > > > c=array([]) > > for x in b: > > c=append(c,a[a==x]) > > > > any way to speed it up? > > > > Thanks! > > -Ning > > > > > It's waiting in Trac for inclusion in numpy > http://projects.scipy.org/numpy/ticket/1036 > The current version only handles arrays with unique elements. > > You can copy the ticket attachment, the version there is very fast. > > Josef > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion >
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