Confirmed in NumPy 1.4.1, Py 2.6.5. David
On Fri, 21 May 2010, James Bergstra wrote: > Hi all, I'm wondering if this is a bug... > > Something strange happens with my ufunc as soon as I use 10000 elements. As > the test shows, the ufunc computes the correct result for either the first > or last 9999 elements, but both at the same time is no good. > > Turns out I'm only running numpy 1.3.0 with Python 2.6.4... could someone > with a more recent installation maybe check to see if this has been fixed? > > Thanks, > > def test_ufunc(): > np = numpy > > rng = np.random.RandomState(2342) > a = rng.randn(10000, 2) > b = rng.randn(10000, 1) > > > f = lambda x,y:x*y > ufunc = np.frompyfunc(lambda *x:numpy.prod(x), 2, 1) > > def g(x,y): > return np.asarray(ufunc(x,y), dtype='float64') > > > assert numpy.allclose(f(a[:-1],b[:-1]), g(a[:-1],b[:-1])) > # PASS > assert numpy.allclose(f(a[1:],b[1:]), g(a[1:],b[1:])) # PASS > assert numpy.allclose(f(a,b), g(a,b)) # FAIL > > > -- > http://www-etud.iro.umontreal.ca/~bergstrj > _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
