F = addBaseChange(E,L)
addBaseChange replaces the transition matrices in E by the matrices in the List L. The matrices in L must be in GL($k$,ZZ) or GL($k$,QQ), where $k$ is the rank of the vector bundle T. The list has to contain one matrix for each maximal dimensional cone of the underlying fan over which E is defined. The fan can be recovered with fan(ToricVectorBundle). The vector bundle already has a list of pairs $(i,j)$ denoting the codim 1 intersections of two maximal cones with $i<j$ and they are ordered in lexicographic order. The matrices will be assigned to the pairs $(i,j)$ in that order. To see which codimension 1 cone corresponds to the pair $(i,j)$ use details(ToricVectorBundle). The matrix $A$ assigned to $(i,j)$ denotes the transition $(e_i^1,...,e_i^k) = (e_j^1,...,e_j^k)*A$. The matrices need not satisfy the regularity or the cocycle condition. These can be checked with regCheck and cocycleCheck.





The object addBaseChange is a method function.