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[Axiom-developer] Eval in Axiom/Aldor

From: Antoine Hersen
Subject: [Axiom-developer] Eval in Axiom/Aldor
Date: Mon, 13 Nov 2006 14:44:26 -0800


I am having some issue with the eval function, any ideas ?
I have reduced my problem to the simplest form.
It is making me crazy !!!

Because UP, which is a PolynomialCat, has InnerEvalable

PolynomialCategory(R:Ring, E:OrderedAbelianMonoidSup, VarSet:OrderedSet):
        Category ==
  Join(PartialDifferentialRing VarSet, FiniteAbelianMonoidRing(R, E),
       Evalable %, InnerEvalable(VarSet, R),
       InnerEvalable(VarSet, %), RetractableTo VarSet,
       FullyLinearlyExplicitRingOver R)

What am I missing ?

Prog :

#include ""

TestEval( x:Symbol , F:Field): with {}
== add {

    import from UnivariatePolynomial(x,F) ;
    import from Fraction UnivariatePolynomial(x,F) ;

    test(a:Fraction UnivariatePolynomial(x,F)):Fraction UnivariatePolynomial(x,F) == {
        eval(a, x, 1)

And here his the error message :

 aldor -M no-abbrev -O -Fasy -Fao -Flsp -laxiom -Mno-AXL_W_WillObsolete -DAxiom -Y $AXIOM/algebra
#1 (Warning) Deprecated message prefix: use `ALDOR_' instead of `_AXL'
"", line 11:                 eval(a, x, 1)
[L11 C17] #2 (Error) No one possible return type satisfies the context type.
  These possible return types were rejected:
          -- Fraction(UnivariatePolynomial(x, F))
  The context requires an _expression_ of type Fraction(UnivariatePolynomial(x, F)).
The following could be suitable if imported:
  eval: (Fraction(UnivariatePolynomial(x, F)), Symbol pretend SetCategory, UnivariatePolynomial(x, F) pretend Type) -> Fraction(UnivariatePolynomial(x, F)) from Fraction(UnivariatePolynomial(x, F)), if UnivariatePolynomial(x, F) has InnerEvalable(Symbol, UnivariatePolynomial(x, F))


Antoine Hersen

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