Formula Node & Array Operations

[simply_me]

Hello,

I'm trying to use the formula node to subtract the previous term from the current term (or the next term minus the current term), but I can't figure out how to

use the array index to do it. 

I've something along the lines of z_array[i+1]-z_array[i], but it only returns the difference of i+1-i....

Please see the attached picture.

Thank you,

[simply_me · Accepted solution]

Problem solved.... 🙂

[Yamaeda]

That would be so easy to do in pure Lv code.