I am a bit lost. Meaning, i dont understand why you need the first number. Why the 1 in 1,5 ?
That '1' is just a virtual number and is in fact just the index on the X-axe.
Meaning, the array can just be 1 dimensional. No more.
It will be 4,8,9
4 on the index 0 on the X-axis
8 on the index 1 on the X-axis
3 on the index 2 on the X-axis
Arrays are zero based.
If you want the second number, that number is at Array.at(1)
Want to compare, it is just Compare at X (x=1)
If you want to scrap the second number just Array>delete .. index = 1 ... Axis = X . The others just shift.
If you want to insert a number so it will land on the second place ... Array>insert .. value is new number .. index = 1 .. Axis = X .. the others auto shift
Loop trough all numbers .. just .. for each element .. X
Let the array take care of that 'first' number. You dont have to. It is just virtual anyway. That is why the Array is how it is made for.