You can also do D[i+1-d>>1:j-3+q*5]
which is actually slightly faster. It looks a bit obscure at first, but now I think of it as the 'halve stuff n times' operator, which is often the correct idiom. On Wednesday, November 18, 2015 at 10:08:08 AM UTC+1, Eric Forgy wrote: > > Hi Jon, > > Have a look at this comment above: > https://groups.google.com/d/msg/julia-users/sEUvnjvtryI/g_vbGQiDBgAJ > > You can try: > > D[i+1-div(d,2):j-3+q*5] > > or the unicode equivalent: > > D[i+1-d÷2:j-3+q*5] > > > > On Wednesday, November 18, 2015 at 4:53:10 PM UTC+8, Jon Norberg wrote: >> >> On a very practical note: >> >> I need to to do inline calculations of indexes such as >> >> D[i+1-d/2:j-3+q*5] >> >> where i,d,j and q are Int64 and d is a multiple of 2 i.e. d/2 should >> always be integer >> >> What is the most efficient way to use an expression as above but to avoid >> the Warning: indexing with non Integer....... ? >> >> Thanks, Jon >> >
