That's a great example for how, in some circumstances, vectorization can be a benefit. A nice addition to the conceptual landscape.
--Tim On Tuesday, August 26, 2014 01:42:59 PM Iain Dunning wrote: > To muddy the water in this now somewhat confusing email thread: > devectorizing/avoiding memory allocation isn't always a win: > > http://stackoverflow.com/questions/25412323/how-can-i-do-a-bitwise-or-reduct > ion-along-an-axis-of-a-boolean-array-in-julia/25414595#25414595 > On Tuesday, August 26, 2014 4:12:49 PM UTC-4, gael....@gmail.com wrote: > > >I'm a little surprised that you have found the performance implications > > > > unconvincing in discussions where the OGs advocate devectorization. > > > > A 10x speed-up on a 10 ms calculation is generally considered > > unconvincing. An unknown gain on an unprofiled code for an undefined > > context is definitely unconvincing, especially if the vectorized form is > > widely clearer. > > > > I'm not talking about this specific case for which I find explicit loops > > at least as clear. But I, too, sometimes find the devectorization advice > > not convincing. But fortunately, this is usually for small scripts, not > > for > > actual Julia libs.
