28 Mar
2010
28 Mar
'10
11:54 a.m.
On 03/28/2010 09:58 AM, Abhishek Sharma wrote:
but what i also noticed was that, at implementation level the _doc2dt was not a matrix but an array of size 6 and if logically seen as matrix -> _doc2dt has 3x2 dimensions, so i didn't quite get as to how it can be an identity matrix,
It's an homogeneous matrix, see http://www.blancmange.info/notes/maths/vectors/homo/ for an explanation. The last section titled "computational efficiency" will shed some light on this.
Regards,
Diederik