USING STREAM GATE?

Hi everybody..

I'm starting this discussion only to ask about how to use a stream component.. The issue is that I don't understand exactly what's a gate and how it may help to manipulate data...And i0ve been surfing the discussions but I still don't get it..

I'm attaching an image.. It's very simple. I would like to have in each list at the end only one value (coresponding to it.. 0 in list 0, 1 in list 1, etc).. .. and the only thing that I've been able to do is refer trhough the integer all the the data into one of outputs.. (this is an example becasue I'm trying to do something a little more complex)...

Thanks a lot..

(probably I should refer to any text.. any ideas?)).