Martin,
On Wednesday, August 24, 2005 8:49 AM you wrote:
> ...
> Now the problem is as follows: the type of the elements of the
> matrix depends on the polytope. For some polytopes, they are
> Integers, for others rationals or floats, or both.
Ideally, I think you might want to return something like:
vertices: % -> Matrix Union (Integer, Float, Fraction Integer)
but unfortunately Axiom does not understand that domain
Union (Integer, Float, Fraction Integer) is actually a RING so
you are not allowed to call it a Matrix.
Instead you might use, for example:
vertices: % -> List List Union (Integer, Float, Fraction Integer)
or maybe
vertices: % -> TwoDimensionalArray Union (Integer, Float, Fraction
Integer)
but note that for some reason
(11) -> x: TwoDimensionalArray Union (Integer, Float, Fraction Integer)
:=new(2,2,0)
(1) [0,0,0,0]
Type: TwoDimensionalArray Union(Integer,Float,Fraction
Integer)
does not print properly (as an rectangular array).
I think there are two possible bug reports here:
1) Union ( list of alternatives that are coercible to some ring )
should be a RING
2) display of TwoDimensionalArray of type Union(...) is not properly
formatted
Do you agree?
Regards,
Bill Page.
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