How do you form a while function using a function file and then using the function file to form a sequence by performing this operation?

How do you form a while function using a function file and then using the function file to form a sequence by performing this operation?

I have this function:

function[v]=collatz(n)
%remainder is 0 when even number is divided by 2
if rem(n,2)==0
   v=n/2;
else 
   v=3*n+1;
end
end 

and I need to use a while function to find out the values for if n starts at n=9 and ends at n=1. How do I do this?

Answer 1

[Jan]

Change n directly and collect the output in the vector v by inserting it at the index end+1:

function v = collatz(n)
v = n;
while n ~= 1
   if rem(n, 2) == 0
     n = n / 2;
   else     
     n = 3 * n + 1;
   end
   v(end + 1) = n;
end
end