  We relate Iwahori-Whittaker functions on metaplectic covers to certain
Demazure-Lusztig operators, the latter of which are built from a Weyl group
action previously considered by G. Chinta and P. Gunnells. Using a certain
combinatorial identity for the sum of these Demazure-Lusztig operators, we
obtain an analogue of the Casselman-Shalika formula for spherical Whittaker
functions in this context.
