MATLAB: Making change with coins, problem (greedy algorithm)

coins

I'm trying to write (what I imagine is) a simple matlab script. I want to be able to input some amount of cents from 0-99, and get an output of the minimum number of coins it takes to make that amount of change. For example, if I put in 63 cents, it should give
coin = [2 1 0 3]
meaning: 2 quarters, 1 dime, 0 nickles, and 3 pennies
Here's where I am at now:
    function[money] = change(money)
    money = [quarter dime nickle penny];
    %initial amounts of each coin
    quarter = 0;
    dime = 0;
    nickle = 0;
    penny = 0;
    money = true;
    while money>=0
            if money >= 25
                    money = money - 25;
                    quarter = quarter + 1;
            elseif money >= 10
                    money = money - 10;
                    dime = dime + 1;
            elseif money >= 5
                    money = money - 5;
                    nickle = nickle + 1;
            elseif money >= 1
                    money = money - 1;
                    penny = penny +1
            end
    end
    clear;clc;
And then this is the error I get from matlab, "Line: 6 Column: 1 "penny" previously appeared to be used as a function or command, conflicting with its use here as the name of a variable. A possible cause of this error is that you forgot to initialize the variable, or you have initialized it implicitly using load or eval."
What (probably very obvious) thing am I missing?

Best Answer

you are writing on to money again and you have an infinite loop
    function[coins] = change12(money)
  %initial amounts of each coin 
  quarter = 0; 
  dime = 0; 
  nickle = 0; 
  penny = 0; 
  % money = [quarter dime nickle penny]; money =[0 0 0 0]
  while money>0 % while money>=0  makes an infinte loop
  if money >= 25 
  money = money - 25; 
  quarter = quarter + 1;
  elseif money >= 10 
  money = money - 10; 
  dime = dime + 1;
  elseif money >= 5 
  money = money - 5; 
  nickle = nickle + 1;
  elseif money >= 1 
  money = money - 1; 
  penny = penny +1;
  end 
  end 
  coins = [quarter dime nickle penny];
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