From: lalbert1@aol.com   
      
   On Tue, 8 Feb 2022 07:10:18 -0800 (PST), "artyw2@yahoo.com"   
    wrote:   
      
   >Yesterday, I was curious about the history of graphs and found that William   
   Playfair was the first to use graphs to plot data. https://en.wi   
   ipedia.org/wiki/William_Playfair   
   >He is credited in inventing bar graphs among other types.   
   >I suspect that Rene Descarte used graphs to draw mathematical functions, but   
   I don't know if he was the first (Anybody know?).   
      
      
   I found the following:   
   "A 1644 diagram by Michael Florent van Langren, showing estimates of   
   the difference in longitude between Toledo and Rome, is sometimes   
   considered to be the first known instance of a graph of statistical   
   data."  - https://www.datavis.ca/papers/langren-TAS09154.pdf   
      
   Les   
      
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