for loop to calculate the value of a recurrence relation

A recurrence relation can be used to model feedback in a system. Given the following recurrence relation, the x vector, and the initial value of y at t=1, write MATLAB code to calculate the y-values corresponding to first 9 x-values. Store the result in the vector y.

the recurrence relation is as seen below

this is my attempt

x = [0 0.39 0.78 1.17 1.57 1.96 2.35 2.74 3.14]; y(1) = 2;

for x=1:0.39:9 t=2:9

y=0.2*x(t)+0.8*y(t-1) end

 where am I wrong?

[Roger Stafford]

That won't work either, Chafah. As I said, you need

 for t = 2:9

not

 for x=1:0.39:9

Answer 1

[Roger Stafford]

You haven't indexed your for-loop correctly. It should read:

 y(1) = 2;
 for t = 2:9
   y(t) = 0.2*x(t)+0.8*y(t-1);
 end

[chafah zachary]

Thanks Roger