> That doesn’t quite seem to do what you want, Mauro: Yes, you're right, sorry for the noise!
> julia> arr_of_arr = Vector{Int}[[1],[2,3],[4,5]] > 3-element Array{Array{Int64,1},1}: > [1] > [2,3] > [4,5] > > julia> vcat_nosplat(y) = eltype(y[1])[el[1] for el in y] > vcat_nosplat (generic function with 1 method) > > julia> vcat_nosplat(arr_of_arr) > 3-element Array{Int64,1}: > 1 > 2 > 4 > > It’s quite trivial to achieve the desired result with only a few lines of > code, though: > > julia> function vcat_nosplat2(y) > result = Array(eltype(y[1]), 0) > sizehint!(result, sum(map(length, y))) #skip if iterating is more > expensive than reallcoation > > for a in y > for x in a > push!(result, x) > end > end > > result > end > vcat_nosplat2 (generic function with 1 method) > > julia> vcat_nosplat2(arr_of_arr) > 5-element Array{Int64,1}: > 1 > 2 > 3 > 4 > 5 > > // T > > On Sunday, November 22, 2015 at 9:12:55 PM UTC+1, Mauro wrote: > > In ODE.jl, I've used >> >> vcat_nosplat(y) = eltype(y[1])[el[1] for el in y] # Does vcat(y...) >> without the splatting >> >> I think the eltype might not be needed. There may be better ways though. >> >> On Sun, 2015-11-22 at 14:04, Cedric St-Jean <cedric...@gmail.com >> <javascript:>> wrote: >> > I have a big vector of vectors. Is there any way to vcat/hcat them >> without >> > splatting? >> > >> > arr_of_arr = Vector[[1],[2,3],[4,5]] >> > vcat(arr_of_arr...) >> > >> > I'm asking because splatting big arrays is a performance issue (and IIRC >> it >> > blows the stack at some point). >> >