Why does my plot not display?

Question

Alex Strongholm 2015-1-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170060-why-does-my-plot-not-display

编辑： GMW 2017-5-8

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

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GMW 2017-5-8

编辑：GMW 2017-5-8

You are missing a 'hold'

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

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Answer 1

David Young 2015-1-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170060-why-does-my-plot-not-display#answer_164966

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.