title: Record a variation of a cell - excel
body: <p>my problem is:</p>
  
  <p>I have a matrix in excel then a function (repeated N times) that extract from this matrix a random number.
  This happen everytime i hit F9 or everytime something change in the sheet.
  After this i have another cell with a sum of all then numbers extracted. I would like to keep track of the change of this last cell in a linear chart to see how it goes on.</p>
  
  <p>Thank you so much in advance</p>