Dear Franz,
I tried your example again (using current svn), and now it works!
Thanks Ralf!!!
Martin
[EMAIL PROTECTED] writes:
> Dear Waldek,
>
> the following strange error happens.
> I wrote a small graph package in aldor,
> mainly to compute adjacency and Laplace matrices
> (which are of type Matrix Integer).
> When I generate a graph in a fresh fricas (gcl, rev 276) session
> **********************************
> G:=new()$FiniteGraph Integer
> addNode!(G,[1,2,3,4,5])
> for i in 1..5 repeat for j in 1..i-1 repeat addEdge!(G,i,j)
> A5:=LaplaceMatrix G
> determinant A5
> **********************************
> I get
>
> Internal Error
> The function determinant with signature hashcode is missing from
> domain Matrix(Integer)
>
> Some observations:
> - If the domain Matrix Integer is loaded _before_ the command
> LaplaceMatrix G is invoked, the error does not occur
> - invoking Matrix Float does not help
> - the same error occurs with minordet,
> but not with other functions from Matrix Integer,
> e.g. trace, rowEchelon, inverse
>
> - the functions determinant and minordet appear always together
> in matrix.spad like
>
> if R has commutative("*") then
> determinant x == determinant(x)$MATLIN
> minordet x == minordet(x)$MATLIN
>
>
> What is going on here?
>
> regards
>
> Franz Lehner
>
>
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