[vorbis-dev] Dot Product

Christian Wassmer chwassme at student.ethz.ch
Wed Feb 18 10:35:43 PST 2004

```
Simeon Maxein wrote:

>>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
But how do I have to apply this dot product. I mean, I have to calculate
a *vector* somehow with the floor-vector and the residue-vector - and
not just a single number. Is it possible that they mean "cartesian
product" instead of "dot product"?

<p>Thanks!
Christian Wassmer

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.

```