Re: Questions from a newcomer...

[Luiz Henrique de Figueiredo <lhf@...>]

>From markv@pixar.com Fri May 14 19:31:45 1999
>
>m = matrix{1.0, 0.0, 0.0, 0.0, 
>           0.0, 1.0, 0.0, 0.0, 
>           0.0, 0.0, 1.0, 0.0, 
>           0.0, 0.0, 0.0, 1.0} ;
>
>
>v = vector{10.0, 3.0, 1.0} ;
>
>newvec = m * v ;
>
>Would it be best to make m and v user data objects, and tag them with types, then override the tag methods to check for these types prior to calling the original tag methods?

try something like this:

MATVEC=newtag()

function matrix(t)
	settag(t,MATVEC)
	t.type="matrix"
	return t
end

function vector(t)
	settag(t,MATVEC)
	t.type="vector"
	return t
end

function do_mul(a,b)
	-- test a.type and b.type and do the right thing
end

settagmethod(MATVEC, "mul", do_mul)

--lhf