Hi Martin, hi Vincent, On Thu, Mar 15, 2012 at 08:43:47AM +0100, Martin Rubey wrote: > I was using lrcalc, and noticed that supplying the weight keyword does > not work, not even the doctest: (this is on sage 4.8) > > lrcalc.lrskew([3,2,1], [2], weight=[3,1]) > > gives "1 not in alphabet". > > I found that the problem is that the row_word of a skew tableau expects > its entries to be from ZZ, while lrcalc uses int's. > > If this is not known, how should it be fixed? Should we convert the > entries of the tableau returned by lrcalc to ZZ's or only when computing > the row_word?
For the record, this only appears when alphabet-vd.patch is applied. Without it, the doctest pass (4.8, 5.0): sage: import sage.libs.lrcalc.lrcalc sage: sage.libs.lrcalc.lrcalc.lrskew([3,2,1], [2], weight=[3,1]) [[[None, None, 1], [1, 1], [2]]] That being said, internally, this tableau indeed contains ints: sage: t = sage.libs.lrcalc.lrcalc.lrskew([3,2,1], [2], weight=[3,1])[0] sage: type(t[2][0]) <type 'int'> Whereas the same tableau build from the command line would be filled with Integers:: sage: t2 = SkewTableau([[None, None, 1], [1, 1], [2]]) sage: type(t2[2][0]) <type 'sage.rings.integer.Integer'> Well, at least, those two tableaux are equal: sage: t == t2 True I let the tableau fans decide whether we want to enforce that all entries of a (skew) tableau are Integers, and if yes to write a patch on lrcalc to convert the ints to Integers. We could throw this in the ticket #12284 which will make lrcalc a standard Sage package. Cheers, Nicolas -- Nicolas M. ThiƩry "Isil" <nthi...@users.sf.net> http://Nicolas.Thiery.name/ -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.