How can I make a program which can determine the coefficients

I want to make a program which can determine the coefficients of a cubic spline. I have the (n+1) points and I want to calculate the value of the n polynomials of spline cubic interpolations

Answer 1

[Torsten]

https://de.mathworks.com/matlabcentral/answers/309182-how-to-get-the-equation-for-a-cubic-spline-from-cubic-spline-function

https://de.mathworks.com/matlabcentral/answers/22790-finding-the-equation-of-spline-in-matlab

[Iulian Negoiu]

Thanks. But can you give me additional information... I have an ideea about how cubic spline functions work and I think that are needed additional requirements