Question

For e.g. any range of number 0 – n

[ 0, 1, 2, 3, 4, 5, 6 ]

to:

[ 0, 2, 4, 6, 4, 2, 0 ]

IS there a formula to calculate the first into the second? Quadratic?
Is there a name for this kind of formula or calculation?

EDIT: This should be in Javascript

Answer 1

I don’t know what you mean by “quadratic-like” but the following javascript program prints something which looks like your sequence:

n = 6;
for(i=0;i<=n;i++){
  print(i, n-Math.abs(2*i-n))
}

Output:

0 0
1 2
2 4
3 6
4 4
5 2
6 0