Why does my plot not display?

I have this function:

function savings
  salary=input('Positive number')
  while salary<0
      soldata=input('Positive number, please')
  end
  daily_spending=input('Negative number')
  while daily_spending>0
      daily_spending=input('Negative number, please')
  end
  savings=salary;
  days=1;|
  day_counter=1;
  months=1;
  while months<=12  
      savings=savings+daily_spending;      
      if days==30;
          months=months+1;
          savings=savings+salary;
          days=0;
      end
      day_counter=day_counter+1;
  days=days+1;
  plot(day_counter, savings);
  pause(0.05)
  end

The problem I have is that when matlab starts plotting, it shows up the figure but not the line. Why is that? I can't figure it out. Could someone help me? This is what it looks like:

PD: Axes refresh well

[GMW]

You are missing a 'hold'

Try: hold on, plot(day_counter, savings, '.')

Answer 1

[David Young]

The problem is that both day_counter and savings are scalars, so there is nothing to plot. I suspect that what you need is to store successive values in an array, and plot the array.

Answer 2

[Adam]

Both day_counter and savings are scalars so it just plots a single point.