Dear R-Users, Is there a way to check within the following dummy function if the strip argument is different from the default set in the function declaration? FYI, this argument should be used downstream in a xyplot call of my actual function. dummyfunction <- function(..., strip = function(...) strip.default(...,strip.names=c(TRUE,TRUE))) {} Thanks for your help -- *Sebastien Bihorel, PharmD, PhD* PKPD Scientist Cognigen Corp Email: sebastien.bihorel at cognigencorp.com <mailto:sebastien.bihorel at cognigencorp.com> Phone: (716) 633-3463 ext. 323