Hi all > Ciao Davide, > > does this do it? > > c <- function(parS, xx) { a + b } > Something similar: this seems to work: a <- function(parS,xx) { parS$a^2 + parS$M } b <- function(parS,xx) { parS$b^2 + parS$M } # note the args for a and b (otherwise give error) c <- function(parS,xx) { a(parS,xx) + b(parS,xx) } parS <- list(a = 100, M=10, b=1000) x <- 1:100 c(parS,x) [1] 1010020 And it works. Sorry if it was off-topic and also silly question.... :-) Best Regards and thanks for help Davide > J. > > On 03/10/2011 12:36 PM, Davide Rambaldi wrote: >> a<- function(parS,xx) { parS$a2 + parS$M } >> b<- function(parS,xx) { parS$b2 + parS$M } >> >> c<- a + b Davide Rambaldi, Bioinformatics PostDoc. ----------------------------------------------------- IFOM-IEO Campus Via Adamello 16, Milano I-20139 Italy [t] +39 02574303870 [e] davide.rambaldi at ifom-ieo-campus.it