Martin Rubey wrote:
>
> I'm currently wondering about the message below. Is this a known misfeature
> of
> the type inference algorithm?
>
> Martin
>
> (1) -> dot([1,2],[a,b])
> There are 2 exposed and 2 unexposed library operations named dot
> having 2 argument(s) but none was determined to be applicable.
> Use HyperDoc Browse, or issue
> )display op dot
> to learn more about the available operations. Perhaps
> package-calling the operation or using coercions on the arguments
> will allow you to apply the operation.
>
> Cannot find a definition or applicable library operation named dot
> with argument type(s)
> List PositiveInteger
> List OrderedVariableList [a,b]
>
> Perhaps you should use "@" to indicate the required return type,
> or "$" to specify which version of the function you need.
>
> (1) -> l1: List POLY INT := [a,b]; l2: List POLY INT := [x,y];
>
> Type: List Polynomial Integer
> (2) -> )se me bo on
> (2) -> dot(l1,l2)
>
> Function Selection for dot
> Arguments: (LIST POLY INT,LIST POLY INT)
> -> no appropriate dot found in List Polynomial Integer
> -> no appropriate dot found in Polynomial Integer
> -> no appropriate dot found in List Polynomial Integer
> -> no appropriate dot found in Polynomial Integer
>
> Modemaps from Associated Packages
> no modemaps
>
> Remaining General Modemaps
> [1] (D,D) -> D1 from D
> if D has VECTCAT D1 and D1 has TYPE and D1 has RING
> [2] (D,D) -> D1 from D
> if D has DIRPCAT(D2,D1) and D1 has TYPE and D1 has RING
> -> no appropriate dot found in Vector Polynomial Integer
> -> no function dot found for arguments (LIST POLY INT,LIST POLY INT)
> [...]
>
What do you find wrong? AFAICS everything works as designed --
the messages are not very helpful, but you can see from them
that dot needs vectors as arguments. If I do:
l1 := vector [1, 2]
l2 := (vector [x,y]) :: Vector POLY INT
dot(l1, l2)
I get:
(5) 2y + x
Type: Polynomial Integer
as expected.
--
Waldek Hebisch
[EMAIL PROTECTED]
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