https://github.com/JuliaLang/julia/issues/new
On Mon, Jul 28, 2014 at 10:06 AM, paul analyst <[email protected]> wrote: > Issue on github or on julia-dev groups? > Paul > > W dniu poniedziałek, 28 lipca 2014 12:05:27 UTC+2 użytkownik Viral Shah > napisał: > >> Please file an issue. I don't think sparse cor() is implemented and is >> falling back to the dense implementation. >> >> -viral >> >> On Monday, July 28, 2014 1:41:55 PM UTC+5:30, paul analyst wrote: >>> >>> Correlation sparse array is very slow. Out of memory on a dense array when >>> we have 30,000 columns. How quickly it calculated? >>> >>> julia> I=int32((rand(10^7)*9999999).+1); >>> >>> julia> J=int32((rand(10^7)*29999).+1); >>> >>> julia> V=int8((rand(10^7)*9).+1); >>> >>> julia> D=sparse(I,J,V); >>> >>> julia> @time cor(D[:,1:30]); >>> elapsed time: 23.806328476 seconds (2458875228 bytes allocated, 0.14% gc >>> time) >>> >>> julia> @time cor(full(D[:,1:30])); >>> elapsed time: 4.494099126 seconds (2732042496 bytes allocated, 5.31% gc >>> time) >>> >>> julia> >>> >>> Paul >>> >>
