On Wed, 26 Dec 2007, Mathew Yeates apparently wrote: > r1=["dog","cat"] > r2=[1,2] > I want to return [["dog",1],["dog",2],["cat",1],["cat",2]]
This is a Cartesian product. Sage has ``cartesian_product_iterator`` for this. Also <URL:http://www.sagemath.org/doc/html/ref/module-sage.combinat.cartesian-product.html> Here is a Cookbook implementation. <URL:http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/302478> The generator may be adequate to your needs. Here is a recursive implementation that does not use multi-dimensional indexing: def set_product(*sets): last_set = sets[-1] drop_last = sets[:-1] if drop_last: result = set( x+(y,) for x in set_product(*drop_last) for y in last_set ) else: result = set( (y,) for y in last_set ) return result Sorry for a late reply. I'm catching up on email... Cheers, Alan Isaac _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
