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Creating a periodic function using XY data set?

I've entered x and y values for a periodic function into a XY data set and now have all of the points plotted. I now need to add a curved line like what you would see in a periodic function but don't know how. I've tried to use the join points option when making the data set but it just makes a straight line between each of the points, I need a curved line instead.

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    Anonymous shared this idea  ·   ·  Admin →

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      • Marc Dancer commented  · 

        In the event that you haven't found a solution yet, here is my suggestion.
        Create a function y=a cos (b (x-c))+d
        Select both the data set and the function, right-click and choose "Best Fit to Data"
        Creating a text box for the function will reveal the parameters.

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