How to fix: Index exceeds matrix dimensions

Hi,

I am new to matlab and am trying to write a function which produces the Fibonacci sequence of input n. I am required to write it in a way so that the program returns all Fibonacci numbers which are less than 3000, including the index of the highest term below 3000. However, I kept getting the error ( Index exceeds matrix dimensions ) at where the if loops is located. May i know how I can change it to make it work?

function y=fibonacci(n)

y(1)=1;
y(2)=1;
for i=3:n
    y(i) = y(i-1)+y(i-2);
    i=i+1;   %#ok<*FXSET>
    if y(i) > 3000
        disp(i-1);
        break
    end
end   

Answer 1

[Torsten]

The for-loop increases i automatically. Thus remove the line "i=i+1".

[Chun Yong Koh]

Really new to this but thanks for the help!