Computes the negative of the (unweighted) Laplacian matrix of the undirected graph associated with a Reaction Network.
i1 : N = reactionNetwork "A <--> B" o1 = A-->B B-->A o1 : ReactionNetwork |
i2 : L = negativeUndirectedLaplacian N o2 = | -1 1 | | 1 -1 | 2 2 o2 : Matrix ZZ <--- ZZ |
A bigger example:
i3 : N = oneSiteModificationA() o3 = S_0+E-->X X-->S_0+E X-->E+S_1 S_1+F-->Y Y-->S_1+F Y-->S_0+F o3 : ReactionNetwork |
i4 : L = negativeUndirectedLaplacian N o4 = | -1 1 0 0 0 0 | | 1 -2 1 0 0 0 | | 0 1 -1 0 0 0 | | 0 0 0 -1 1 0 | | 0 0 0 1 -2 1 | | 0 0 0 0 1 -1 | 6 6 o4 : Matrix ZZ <--- ZZ |
The object negativeUndirectedLaplacian is a method function.