On Wednesday 22 June 2016 16:58, Steven D'Aprano wrote: > But it makes no sense to me to introduce a NAN into a calculation > just because you multiply by 1, even if it includes an INF. And multiplying > by -1 should be identical to negating.
Ah, not one second after I hit send, it struck me -- Python is casting the non- complex factor to complex before doing the multiplication! So: 1*(INF+2j) which I was expanding into (1*INF) + (1*2j) = (INF+2j), gets performed by Python as: (1+0j)*(INF+2j) = 1*INF + 1*2j + 0j*INF + 0j*2j = INF + 2j + NANj - 0 = INF + NANj -- Steve -- https://mail.python.org/mailman/listinfo/python-list
