# Notation for a continious function represented as a list of numbers in discrete steps

If we have some function, let’s say
$$f(t) = cos{(omega_{0} t)} text{,}$$
but I want to represent it for discrete steps of $$t$$, i.e. $$Delta t$$. Is there a notation for this? I want to say a list of numbers from $$f(t)$$ in steps of $$Delta t$$. Or that using $$f(t)$$ I generate a list of numbers for every $$Delta t$$.

Perhaps
$$f(Delta t) = { cos{(omega_{0} Delta t)} }$$
?