Interpolation Help Please...

[Dedpuhl]

I want to interpolate numbers from a chart. There is a simple equation that can be used to do this. Does anyone know this small formula to do general interpolation?

 

[Dedpuhl]

 

[samarth]

Pn-1 (x) = Summation [ [Yk] * [product(j!=k) (x - xj)] / [product(j!=k) (xk - xj)] ]

dont know if this is what you are looking for
this will make the polynomial pass throught all the points in the data

 

[samarth]

dont know if this helps, but this is just a random site i found

http://www2.egr.uh.edu/~rbarton/Classes/ECE2331/Files.pdf/Notes/Notes_9-12-00.pdf

 

[ApacheXMD]

Linear Interpolation

Or just do it the easy way and use your calculator (All TI graphing calculators have this builtin)

-patchy