Linear interpolation Using Polyfit

How do i find p (polyfit) from this X1 and Y1 values i attached

I expect to get like this images

Answer 1

[Bjorn Gustavsson]

Repeat question.

What's missing from the answer I gave you here: Using polyfit for linear regression?

Perhaps explicitly telling you to use the call to polyfit in the documentation? Well do that, and you'll get a 7th order polynomial approximation to the sin-curve in that intervall.

Polynomial regression will not easily give you linear interpolation though, that is a completely different operation where you get points on line-segments connecting your data-points. See the help and documentation for interp1, for more information about that.

[agung pratama]

Thanks, but i repeat it because i dont get the answer that i ask for