How to use a for loop to get previous values to calculate next one

I am having trouble with my foor loop. I want to get the previous value to use in the next calculated value.

x(1) = A+B*(-K*cl^(k-1));
for k=0:4
    x(k) = A*x(k-1) + B*(-K*cl^(k-1));
end

Error I keep getting is:

Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.