From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2002-01-19 04:37:59
jhrwalter wrote:
>>>as I know multiplication with a scalar is mathematically always
>>>defined as left multiplication for vectors and matrices.
>>>
>>
>>theoretically scalar-matrix multiplication is commutative and thus
>>
> a * M
>
>>== M * a.
>>
>
> Hm. I'm not sure, if the rhs is defined at all.
>
check out
boost/libs/numeric/doc/LinearAlgebraConcepts.html#VEctorSpace
for instance.
>
> Division is another topic. We once discussed to introduce such a
> division operator for accuracy reasons, although it's usually not
> defined mathematically, too.
>
what's the diff between M * ( 1 / a ) and M / a * 1
>
>>Although I think in the long term, all mathematical correct
> expressions
>>should be supported but it is not highest priority.
agreed.