For all those who want to understand better the requirement, this post is a follow-up on this one: I need to create a graph from a hash using GD else GD::Graph.

As I told you, if I understood correctly what you are looking for, your hash does not contain the proper data structure, since it contains only one single array with all the data, whereas you needed, from what you said, an array of arrays. I have shown you in the other thread a way to obtain an array of arrays, but it seems you did not see it (you may have to click on the readmore tag).