[R] problem with unlist

r.ghezzo heberto.ghezzo at mcgill.ca
Mon Feb 23 16:55:50 CET 2004

Hello, I try to compute means,sd,n from a variable y according to some 
categoricals g1,g2... I wrote the following function:
msd<-function(y,...) {
    funy<-function(x) list(mean(x,na.rm=T),sd(x,na.rm=T),table(is.na(x))[1])
    gg <- list(...)
this works OK so far there is no empty cell in the crosstab, if there 
is, the unlist statement just run over it and I do not know which cell 
is missing, any attempt to label the columns in matrix bb then fail.
Can somebody suggest a method to retrive the list names from aa to label 
the columns of the matrix bb?
Thanks for any help
Heberto Ghezzo
McGill University
Montreal Canada

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