Go back to First Math
screen HyperGraph Table
of Contents. 
HyperGraph Home
page. Digital Filtering Methods
Savitsky - Golay filtering in 1-D.
can replace i-th point with simple "tent filter"
Yi ¬ 1 . Yi-1 + 2 . Yi + 1 . Yi+1 --------------------------------- 4
or in general Yi ¬ Snj=-n aj Yj -------------------- Snj=-n aj
If we choose aj's in appropriate manner (Savitsky - Golay), then the above formula is equivalent to computing a polynomial least square fit for each point on curve.
Go back to First Math
screen
HyperGraph Table
of Contents.
HyperGraph Home
page.