The `for` statement makes it convenient to
execute a routine repeatly while counting iterations of a loop.
It looks like this:

for i = 1:5 x(i) = i^2; end

The above code works by first evaluating the expression 1:5 to produce a range
of values from 1 to 5.
Then the variable `i` is assigned the first element of the range and

x(i) = i^2;in the loop is executed once. And this process continues until there are no more elements to assign for

function z = AR3(a,x,n) z = x; for i = 4:(3+n) z(i) = a(1) * z(i-1) + a(2) * z(i-2) + a(3) * z(i-3); end

Department of Mathematics