Sort matrix based on the elements of a specific column

General Usage
5

I had the same issue, but I needed to break ties and didn’t want to use DataFrames. Here is a suggestion (the default behavior is like Matlab’s, otherwise one can specify a matrix of elements to sort on):

function sortrows(M, by=zeros(0))
    if by == zeros(0)
        order = copy(M)
    else
        order = copy(by)
    end
    if size(order,2) > 1
        order = Float64.(order.-minimum(order, dims = 1))
        order = (order./maximum(order,dims=1))*(10).^(size(order,2):-1:1)
    end
    order = sortperm(order[:,1])
    return M[order,:], order
end

A = [4 1 1; 3 2 5;2 4 3]'
sorted_A, order = sortrows(A,A[:,[1,3]])

julia> sorted_A
3×3 Array{Int64,2}:
 1  5  3
 1  2  4
 4  3  2