Im working on higher degree interpolation:

I'm asked to explain why

L0(x) + L1(x) + L2(x) + L3(x) = 1 for n=3

Not sure why this is...any advice? Thanks.

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- October 14th 2009, 11:30 PMjzelltInterpolation #2
Im working on higher degree interpolation:

I'm asked to explain why

L0(x) + L1(x) + L2(x) + L3(x) = 1 for n=3

Not sure why this is...any advice? Thanks. - October 15th 2009, 04:51 AMHallsofIvy
I have no idea what you are doing. What Data are you interpolating? Is this a third degree interpolation? What are L0, L1, L2, and L3?

Just offhand it looks to me like this is saying that you are giving "equal weight" to the four calculations but other than that I can't say without more information. - October 17th 2009, 09:38 PMjzellt
Ok...sorry.

The hint given is to use Pn(x) = y0L0(x) + y1L1(x) + ... + ynLn(x).

(This is the interpolating polynomial of degree >= n)

So, Im supposed to use the above hint with suitable choices for {y0, y1, y2, y3) to show:

L0(x) + L1(x) + L2(x) + L3(x) = 1. Any advice... - October 17th 2009, 10:10 PMmr fantastic