
    Hi R people:
  
 On page 235 of the Blue Book (Becker, Chambers, and Wilks), there is a "compose2" function.
  
 compose2 <- function(f,g) {
 gg <- substitute(g1(x))
 print(gg)
 gg[[1]] <- g
 ff <- substitute(f1(y))
 print(ff)
 ff[[1]] <- f
 ff[[2]] <- gg
 print(ff)
 fun <- function(x){ NULL }
 fun[[2]] <- ff
 fun
}

 However, when I run this function using sum and log (as in the example), I get the following error:
  
 Error in fun[[2]] <- ff : object of type 'closure' is not subsettable
>
 Has anyone else run into this, please?
 Or is this a merely an issue with a dated concept, please?
  
 Thanks in advance,
 Sincerely,
 Erin Hodgess
  
 mailto: hodgess@gator.uhd.edu
  
 
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