[vorbis-dev] Dot Product

[Simeon Maxein]

> I don't exactly understand what they mean by "multiply each element of
> the floor curve by each element of that channel's residue vector"?
> Supposing one channels floor vector is (3,2,1) and the according residue
> is (1,0,2), the resulting "dot-producted" vector will be (3,0,2)?
> However, that's how I've implemented but it seems to be wrong. So what't
> the correct interpretation of this dot-product?

The dot product is a vector multiplication that is calculated as follows:
(Ax,Ay,Az) dot (Bx,By,Bz) = Ax*Bx + Ay*By + Az*Bz

So the result is not a vector, but a number. For your example:
(3,2,1) dot (3,0,2) = 3*3 + 2*0 + 2*1 = 11

The 3dica 3d programming tutorial has quite a good introduction to vector
calculations, you can find it, for example, at
http://tfpsly.planet-d.net/Docs/3dIca/3dica.htm

Simeon

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