On Mon, 2014-03-03 at 22:26 +0100, Eelco Hoogendoorn wrote: > The tuple gets cast to an ndarray; which invokes a different codepath > than the scalar addition. > > > Somehow, numpy has gotten more aggressive at upcasting to float64 as > of 1.8, but I havnt been able to discover the logic behind it either
There were changes in the casting logic in 1.7, I think. I can't really remember changes after that, so if there is a change, we might want to check it out. (Or I am just missing something completly :)) - Sebastian > > On Mon, Mar 3, 2014 at 10:06 PM, Nicolas Rougier > <[email protected]> wrote: > > Hi all, > > I'm using numpy 1.8.0 (osx 10.9, python 2.7.6) and I can't > understand dtype promotion in the following case: > > >>> Z = np.zeros((2,2),dtype=np.float32) + 1 > >>> print Z.dtype > float32 > > >>> Z = np.zeros((2,2),dtype=np.float32) + (1,1) > >>> print Z.dtype > float64 > > > Is this the expected behavior ? > What it the difference between the two lines ? > > > > Nicolas > _______________________________________________ > NumPy-Discussion mailing list > [email protected] > http://mail.scipy.org/mailman/listinfo/numpy-discussion > > > _______________________________________________ > NumPy-Discussion mailing list > [email protected] > http://mail.scipy.org/mailman/listinfo/numpy-discussion _______________________________________________ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
