[GAP Forum] represent elements of Weyl groups or affine Weyl groups in terms of matrics

[Jianrong Li]

Dear Forum,

Let s_1, ..., s_n be simple reflections. w=s_{i_1}...s_{i_k} be an element
of Weyl group. Is there some function in GAP which can produce the matrix
expression of w? Thank you very much.

Best wishes,
Jianrong.