Adding a best fit curve to a scatter plot
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I have a scatter plot consisted of 620 points. I want to set the best fit curve rather than me using the "polyfit" function and then use "polyval". In that case I am the one who changes the degree. I also want to show the equation corresponsing to the best fit curve.
When explaining me the procedure, please use some random numbers to X and Y vectors so I can better understand it.