For more information about this meeting, contact Svetlana Katok, Robin Enderle, Flossie Dunlop.
|Title:||Being right more often can make you more wrong|
|Speaker:||John Roe, The Pennsylvania State University|
|Suppose that we know the values of a function f(x) at (n+1) different x-values, say in the interval [0,1]. A polynomial function p(x), of degree n, can be put through these (n+1) points and it is natural to use p as an approximation to f for other x-values also. This idea, called "polynomial collocation", is one of the oldest in numerical analysis.
I'll explain some of the techniques that were used in the B.C. (=before computer) era to carry out these calculations using pencil and paper. Then, I'll show you a surprising fact: as n increases (so that the number of points at which the approximation is "right" gets larger), the difference between p(x) and f(x) for other x-values can increase without bound. In brief, being right more often can make you more wrong.|
Room Reservation Information
|Date:||04 / 05 / 2012|
|Time:||02:30pm - 03:30pm|