# [racket] Computing dot product via racket math library

matrix-dot is what you want.
Tobias
On Thu, 24 Oct 2013 16:59:15 +0200, Dmitry Cherkassov
<dcherkassov at gmail.com> wrote:
>* I've tried using racket math library to compute dot product of two
*>* vectors, but haven't found the very function to compute it.
*>*
*>* What i've found so far is to use matrix* function, but two drawbacks:
*>* 1. I have to transpose the right multiple (extra overhead)
*>* 2. It yields single-element matrix:
*>* > (matrix* (matrix ([1 2])) (matrix ([2] [1])))
*>* (array #[#[4]])
*>*
*>* So i need to extract it (for example calculating the determinant
*>* :)
*>*
*>* So the questions are:
*>* A. Is there dot product function available?
*>* B. Is there any reason that matrix* yields single-element matrix (2)
*>*
*>*
*>* Thanks
*
--
---------------------------------------------------------
Tobias Hammer
DLR / Robotics and Mechatronics Center (RMC)
Muenchner Str. 20, D-82234 Wessling
Tel.: 08153/28-1487
Mail: tobias.hammer at dlr.de