Possible Duplicate:
Writing a function $f$ when $x$ and $f(x)$ are known
I'm not versed in mathematics, so you'll have to speak slowly...
If I want to fit a curve to the points,
X Y 1 0.5 2 5.0 3 0.5 4 2.5 5 5.0 6 0.5
Where would I begin? For my purposes, this needs to be a sixth-order fit...