Whether the call to fn only queries the state it may set, as par("mar"), options("digits") and palette() do, which hand that state back visibly where setting it returns the previous one invisibly.
fn
par("mar")
options("digits")
palette()
Whether the call to
fnonly queries the state it may set, aspar("mar"),options("digits")andpalette()do, which hand that state back visibly where setting it returns the previous one invisibly.