Function Calculates Fibonacci Numbers

My task is to write a function that calculates the nth Fibonacci number by making a call to 'nniadd', a program I have previously written. nniadd preforms the addition of two nonnegative integers where the integers and their sum are given in row vector form (12345 = [1 2 3 4 5]). nniadd also have definitions in the program that are as follows:

x = a nonnegative integer in row vector form

y = a nonnegative integer in row vector form

x_plus_y = the sum of x and y in row vector form

I am pretty sure the goal of this assignment is to replace the addition in the fibonacci definition with the program 'nniadd' however I am not sure how to do so. Here is what I have so far, please help me with what to do next.

function Fn = ex1(n)
%
%
if n < 3
    Fn = 1;
else
    Fn_2 = 1;
    Fn_1 = 1;
    for k = 3:n
        Fn = Fn_1 + Fn_2;
        Fn_2 = Fn_1;
        Fn_1 = Fn;
    end
end 
my_function(nniadd);

[Sophie Culhane]

I changed my program a small amount, but I am still receiving an error message.

function Fn = ex1(n) % % if n < 3 Fn = 1; else Fn_2 = 1; Fn_1 = 1; for k = 3:n Fn = nniadd(Fn_1, Fn_2); Fn_2 = Fn_1; Fn_1 = Fn; end end

Answer 1

[Stephen23]

n = 13;
prv = 0;
out = 1;
for k = 3:n
    [out,prv] = deal(out+prv,out); % replace |+| with your function NNIADD
    disp(out)
end

     1

     2

     3

     5

     8

    13

    21

    34

    55

    89

   144