14 Mar
2014
14 Mar
'14
7:50 p.m.
On Sat, 15 Mar 2014 12:41:23 +1300 Greg Ewing <greg.ewing@canterbury.ac.nz> wrote:
Steven D'Aprano wrote:
I suppose because unconsciously I associated it with the common shorthand implying (scalar) multiplication:
5kg of apples @ $2 per kg costs $10.00
That analogy actually extends to the matrix case as well. E.g. if you have a vector q of quantities and a vector p of prices, then q @ p is the total price.
It depends how the vectors are layed out (horizontal @ vertical or vertical @ horizontal). Regards Antoine.