cubic interpolation formula

Hi there,

I am new to cubic interpolation and i am trying to code it. I just want to understand the formula to calculate cubic interpolation. If anyone could explain it, i would be most grateful.
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Which cubic interpolation formula?
Given any 4 points, you can find a cubic polynomial that fits those points, and solving for the coefficients can give you a formula for it.
You can also fit to constraints on first and second order derivatives, which would imply other formulas which you could similarly solve for.

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Cubic interpolation is most commonly used by fitting a cubic through 3 points so leaving you with extra constraints to define the derivatives at either end. These are call cubic splines and come in many different forms. They are generally defined parametrically.

Cubic interpolation is a very big area. More detail as to what you'd like explained would be helpful.
dhsindyRetired considering supplemental income.Commented:
There a least two I am aware of bi/mono.  Have a look at this website:
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