any options can be defined, using name = value or by passing a list of such tagged values.
x
a character string holding an option name.
Value
SweaveListingOptions() returns a list of the global variables.
SweaveListingOptions(x) returns the global variable x.
getSweaveListingOption(x) returns the global variable x.
SweaveListingOptions(x=y) sets the value of the global variable x to y.
SweaveListingoptions
For compatibility with spelling in package distr, SweaveListingoptions is
just a synonym to SweaveListingOptions.