Delta in Lua

[decyg]

Hey, i was wondering how i could find/create a delta variable in lua, if you have ever used expression two then you will know what i am talking about, if not, then i'm basically trying to check if a variable is different than what it was a millisecond or a bit ago and if so, return one.

Thanks!

[Kogitsune]

delta = currentval - lastval
lastval = currentval

[decyg]

Thanks!