> See for example the problems with Julia where column and row vectors are totally different types: http://2pif.info/op/julia.html http://2pif.info/op/julia.htm

> See for example the problems with Julia where column and row vectors are totally different types: http://2pif.info/op/julia.html http://2pif.info/op/julia.html That was one year ago. They are still different types, but they behave as you would expect wrt arithmetics. julia> x = [1,2,3] 3-element Int64 Array: 1 2 3 julia> y = [1 2 3] 1x3 Int64 Array: 1 2 3 julia> y' 3x1 Int64 Array: 1 2 3 julia> x + y' 3x1 Int64 Array: 2 4 6 Their size and dimensions are still different, though, but it is mostly a concern for library writers. julia> ndims(x) 1 julia> ndims(y) 2 julia> ndims(y') 2 julia> size(x) (3,) julia> size(y) (1,3) See https://groups.google.com/forum/?fromgroups=#!msg/julia-dev/W2C9-HbXH3o/P8A8jo7FHSoJ https://groups.google.com/forum/?fromgroups=#!msg/julia-dev/... for the discussion that resulted from that post. Edit: I should add that there's now a mailing list dedicated to statistics with Julia: https://groups.google.com/forum/#!forum/julia-stats https://groups.google.com/forum/#!forum/julia-stats