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Subject: Re: [boost] different matrix library?
From: joel (joel.falcou_at_[hidden])
Date: 2009-08-15 02:28:18

Edward Grace wrote:
> Err - surely the point of overloading is to assign meaningful context
> specific behaviour to the same operator, so.
> unsigned a,b,c; c = a ^ b; // ^ => XOR makes sense.
> pseudovector<3> c;
> vector<3> a,b; c = a ^ b; // ^ => Wedge product makes sense XOR
> does not.
Well, except there is use case in computer vision or machien learning in
which you have large matrix of integer on which you apply bitwise
operation before feeding to some solver. ^ is clearly 'elementwise xor'
in this context.

so wedge_product is a better alternative.
> If, for example, b and c were pseudovectors then s would be a (true)
> scalar and could be assigned to the concrete type double. This is
> where carrying along some (meta) information concerning the
> transformation rules of these different entities would be both tricky
> and crucial.
In NT2 matrix of size(1,1) are castable to scalar and such operations
works flawlessly.

Joel Falcou - Assistant Professor
PARALL Team - LRI - Universite Paris Sud XI
Tel : (+33)1 69 15 66 35

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