How do I concatenate my changing output from a while loop?

I have wrote a code for my home mortgage calculations. The code pretty much runs a simulation on how sooner I would get down with my outstanding principal balance given an additional amount paid each month? I have used a while loop until my principal balance is greater than 0. My counter is the months. So I would like to know how I can plot the counter (months) and the outstanding balance each iteration?

Here is the code:

function out1 = mortgage(outstanding,interestrate,additional)
p = outstanding;
i = interestrate./100;
escrow = 2339.10./12;
payment = 1268.85;
out1=[];
counter=1;
counter1=1;
while p>0
    interest = (p.*i)./12;
    principal = payment-interest-escrow;
    tp = principal+interest+escrow;
    if counter1==12
        p=p-tp-additional-31.25-1268.85;
        counter1=1;
        counter=counter+1;
    else
        p = p-tp-additional-31.25;
        counter = counter+1;
        counter1=counter1+1;
    end
    out1=counter;

end

Answer 1

[Geoff Hayes]

Yogesh - since the outstanding balance is p, then this is the value that you want to save on each iteration of the while loop. Outside of your loop, initialize a variable as

 outstandingBalance = p;

Then in the last line of your loop just do

 ...
 outstandingBalance = p;
 while p>0
    ...
    out1=counter;
    outstandingBalance = [outstandingBalance p]; % update the array of balances
 end

Try the above and see what happens!

[Yogesh Brahmbhatt]

It worked! Thanks Geoff.