How to reference past values?

how do I reference past values of a function?

as in f(x) = 0.7*(f(x-1))

Answer 1

[Roger Wohlwend]

In general you have to use a loop for that. However, in your simple case it is not necessary.

f(x) = 0.7^x * f(0)

where f0 is the inition condition.

So if you want a vector with the first n values of the function, use the following Matlab code:

f = 0.7.^(1:n) * f0

where f0 is the initial condition, a scalar.