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 >> >
