09-18-2018 01:51 AM
It seems logical that generating 4000 points in a single instance, might not be giving perfect sine wave. And hence we see the difference in plot.
Thanks Bob_schor and others for your valuable time and insights!
09-19-2018 10:28 PM
You are welcome. You ask sensible questions, and (fortunately) there are (sometimes) sensible answers ...
Bob Schor