Tidy up a hyper2 object by removing players about which we
have no information
Usage
tidy(H)
Arguments
H
A hyper2 object
Author
Robin K. S. Hankin
Details
Function tidy(H) returns a hyper2 object mathematically
identical to H but with unused players (that is, players that
do not appear in any bracket) removed. Players about which H
is uninformative are removed from the pnames attribute.
Note that idiom pnames(H) <- foo can also be used to manipulate
the pnames attribute.