Re: Quaternions and the stock market



Timothy Murphy wrote:
> schoenfeld1@xxxxxxxxx wrote:
>
> > Simple challenge for you:
> > I have a vector A=<x,y,z>
> > I have a direction vector B=<a,b,c>
> > I have an angle r.
>
> Assume B is of unit length.
> Write v = ai + bj + ck
> Set q = cost + sint v
> and consider qAq*

I've restored the section you surreptitiously snipped.

"Rotate the vector A about B by r radians using a Quaternion Q. Show
the
solution in terms of floating point calculations (hint: a matrix might
be useful).
I note a priori your failure to come through with this challenge."

and note a posteriori your failure to come through with this challenge.

>
> --
> Timothy Murphy
> e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie
> tel: +353-86-2336090, +353-1-2842366
> s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

.

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