Sorting and Related Functions
Sorting and Related Functions
Julia has an extensive, flexible API for sorting and interacting with already-sorted arrays of values. By default, Julia picks reasonable algorithms and sorts in standard ascending order:
julia> sort([2,3,1])
3-element Array{Int64,1}:
1
2
3
You can easily sort in reverse order as well:
julia> sort([2,3,1], rev=true)
3-element Array{Int64,1}:
3
2
1
To sort an array in-place, use the “bang” version of the sort function:
julia> a = [2,3,1];
julia> sort!(a);
julia> a
3-element Array{Int64,1}:
1
2
3
Instead of directly sorting an array, you can compute a permutation of the array’s indices that puts the array into sorted order:
julia> v = randn(5)
5-element Array{Float64,1}:
0.297288
0.382396
-0.597634
-0.0104452
-0.839027
julia> p = sortperm(v)
