Implementation details can make a very big difference in the performance of Julia code. You can see some considerations at http://docs.julialang.org/en/latest/manual/performance-tips/.
Also, if you post your test code, perhaps as a Gist, that will make it easier for folks to provide useful feedback. cheers, Keith On Friday, July 11, 2014 12:28:15 PM UTC-4, David C Cohen wrote: > > Hi, > > I understand that Julia and R nnls do not use the same algorithm. A > 400x300 problem on my machine takes about 0.02 s on R nnls, and about 2 s > on Julia nnls. > > The documentations on nnls is rather poor: > > ?nnls > > nnls (generic function with 2 methods) > > > Am I missing something here, or is this implementation is meant to be slow? > >
