On Thu, Jun 4, 2009 at 8:23 AM, Alan G Isaac <ais...@american.edu> wrote: > a[(a==b[:,None]).sum(axis=0,dtype=bool)]
this is my preferred way when b is small and has unique elements. if the elements in b are not unique, then be can be replaced by np.unique(b) If b is large this creates a huge intermediate array The advantage of the new setmember1d_nu is that it handles large b very efficiently. My try on it was more than 10 times slower than the proposed solution for larger arrays. Josef > hth, > Alan Isaac _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
