Basically, you need to build, in Sage, a string to pass to M2. E.g.:
sage: a=1; b=31; macaulay2('G =
graph({{'+str(a)+',2},{2,'+str(b)+'},{'+str(b)+',4}})')
Graph{1 => {2} }
2 => {1, 31}
4 => {31}
31 => {2, 4}
Ideally, you'd develop methods for Sage types to convert them to M2 types.
So that macaulay2(G) would create a handle to a M2 object which is an M2
graph.
Currently there are such functions for rings, polynomials, and ideals:
sage: R2 = macaulay2.ring('QQ', '[x, y]'); R2 # optional -
macaulay2QQ[x..y, Degrees => {2:1}, Heft => {1}, MonomialOrder => {MonomialSize
=> 16}, DegreeRank => 1]
{Lex => 2 }
{Position => Up }sage: I = macaulay2.ideal( ('y^2 - x^3', 'x - y') ); I #
optional - macaulay2
On Thursday, June 30, 2016 at 9:36:19 AM UTC+1, [email protected] wrote:
>
> Hi,
>
> I do some calculations about graphs and ideals via M2 interface of Sage or
> just using M2, but for that, I have to use M2 input as below:
>
> sage: macaulay2('loadPackage "Graphs"')
> sage: macaulay2('G = graph({{1,2},{2,3},{3,4}})')
>
> as explained in the link:
>
> http://math.uiuc.edu/Macaulay2/doc/Macaulay2-1.8.2/share/doc/Macaulay2/Graphs/html/_graph.html
> Is there a way to convert a graph or an ideal written in Sage code into
> Maculay2 ones so that it can be employed in M2 interface. For instance,
>
> sage: d={1:[2], 2:[1,3], 3:[2,4], 4:[3]}
>
>
> sage: G = Graph(d)
>
> sage: macaulay2('H=graph(G)') (or H=macaulay2('graph(G)'))
>
>
> Of course M2 won't accept my silly code in the 3rd line, but I've tried
> various ways like injecting a square free-quadratic-monomial ideal or edge
> list of a graph into M2 and I always fail.
> I also have the same problem for ideals.
>
> It's a long-standing problem of mine and it costs me writing heavy codes in
> Sage for multiple calculations. Calculating via M2 with Sage inputs will save
> lots of my time.
>
> Can anyone help?
>
> Thanks in advance! :)
>
>
> Best Regards
>
> Mehmet
>
>
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