F = addBase(E,L)
addBase replaces the basis matrices in E by the matrices in the List L. The matrices in L must be in GL($k,R$), where $k$ is the rank of the vector bundle E and $R$ is ZZ or QQ. The list has to contain one matrix for each ray of the underlying fan over which E is defined. Note that in E the rays are already sorted and that the basis matrices in L will be assigned to the rays in that order. To see the order use rays(ToricVectorBundle).
The matrices need not satisfy the compatibility condition. This can be checked with isVectorBundle.





The object addBase is a method function.