su, 2010-06-20 kello 13:56 -0400, Tony S Yu kirjoitti: > I came across some strange behavior when multiplying numpy floats and > python lists: the list is returned unchanged: > > > In [18]: np.float64(1.2) * [1, 2] > > > > Out[18]: [1, 2]
Probably a bug, it seems to round the result first to an integer, and then do the usual Python thing (try for example np.float64(2.2)). I'd suggest filing a bug ticket. Looking at CPython source code, the issue seems to be that np.float64 for some reason passes PyIndex_Check. But (without whipping out gdb) I can't understand how this can be: the float64 scalar type is not supposed to have a non-NULL in the nb_index slot. Indeed, a np.float64.__index__ method does not exist, and the following indeed does not work: [1, 2, 3][np.float64(2.2)] Strange. -- Pauli Virtanen _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion