Find a Sine Wave Generator to Plot Excel Data and Extrapolate

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A user is seeking a Sine Wave Generator program capable of plotting Excel data and extrapolating a sine wave along with its harmonics. While MatLab can connect to Excel, it does not produce a smooth sine wave. The discussion highlights that Excel's SINE function can generate a sine wave, but it is noted that a pure sine wave inherently does not contain harmonics. Suggestions for freeware options are welcomed.
Philosophaie
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Does anyone know a Sine Wave Generator program that will plot Excel Data and extrapolate a a sine wave with its harmonics?

I know MatLab will connect but will not make a fluid sine wave. Freeware suggestions welcomed.

Any suggestions?
 
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Your question is confusing. I offer these two observations:
1. You can generate a sine wave using Excel's SINE function.
2. A pure sine wave has no harmonics.
 

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