How can I plot a stepwise function like
f[a, t] = 10 Exp[-0.1 Sin[t]] for
a > t and
f[a, t] = f[a, t - 1] Exp[-0.1 a] for
a < t? If you see, for
a < t, the function
f[a, t] dependes on a previous value of itself.
Two defintions of f, one each side of a.
I can't understand your question, what is "sent" etc. but try this for a starting point