How to write a 'for' loop?

Hi Everyone,

I can't seem to understand why this function using a for loop doesn't seem to work.

    function y = get_kV(n,t)

    for k = 1:(n-1)
        y = [t(1) t t(end)];
    end

I tried it out:

    kV = [0 4];
    kV = get_kV(3, kV);

The answer should be kv = [0 0 0 4 4 4]

But it only goes through the iteration once and stops. I've written the exact same code in the Command Window and that works but why doesn't it work when I save it as a .m file?

Thanks for any help or advice. Cheers!

Answer 1

[Walter Roberson]

You are overwriting "y" in every iteration of the loop. Only the final version of "y" is returned to the calling routine.

[jljl]

Thanks for the fast reply, do you have any suggestions to correct it so that the function works correctly?

[Jan]

@jljl: Please accept an answer, if it solves your problem sufficiently.

Answer 2

[Jan]

function y = get_kV(n,t)
y = repmat(t, n, 1);
y = y(:)'