[R] Function call within a function.

[John Kane]

--- Stephen Tucker <brown_emu at yahoo.com> wrote:

> Dear John,
> 
> Perhaps I am mistaken in what you are trying to
> accomplish but it seems like
> what is required is that you call lstfun() outside
> of ukn(). [and remove the
> call to lstfun() in ukn()].
> 
> nts <- lstfun(myfile, aa, bb)
> results <- ukn(dd1, "a", "b", nts$cda)

Yes this definately will work but seems sloppy.  What
I am doing in 'real' life is trying to sort a set of
data.frames into   a two element list ( lstfun) and
then apply some further subsetting to each data.frame
in the list separately.  
> 
> Alternatively, you can eliminate the fourth argument
> in ukn() and assign (via
> '<-') the results of lstfun() to 'nam1' within ukn()
> instead of saving to
> 'nts'...
Humm, I'll have to think about this. The problem, as I
have set up the program is that nam1 is one of the two
data.frames in the list.  

I may have to reconsider this whole thing.  I have
been trying to use the existing data structures and I
may need to start from scratch.  

Thanks for the help.  You have given me some useful
ideas.

John

> 
> --- John Kane <jrkrideau at yahoo.ca> wrote:
> 
> > I am trying to call a funtion within another
> function
> > and I clearly am misunderstanding what I should
> do. 
> > Below is a simple example.
> > I know lstfun works on its own but I cannot seem
> to
> > figure out how to get it to work within ukn.
> Basically
> > I need to create the variable "nts". I have
> probably
> > missed something simple in the Intro or FAQ.
> > 
> > Any help would be much appreciated.
> > 
> > EXAMPLE
> >
>
-------------------------------------------------------------------------------
> > # create data.frame
> > cata <- c( 1,1,6,1,1,4)
> > catb <- c( 1,2,3,4,5,6)
> > id <- c('a', 'b', 'b', 'a', 'a', 'b')
> > dd1  <-  data.frame(id, cata,catb)
> > 
> > # function to create list from data.frame
> > lstfun  <- function(file, alpha , beta ) {
> > cda  <-  subset(file, file[,1] == alpha)
> > cdb  <-  subset (file, file[,1]== beta)
> > list1 <- list(cda,cdb)
> > }
> > 
> > # funtion to operate on list
> > ukn  <-  function(file, alpha, beta, nam1){
> > aa  <- alpha
> > bb  <- beta
> > myfile  <- file
> > nts <- lstfun(myfile, aa, bb)
> > mysum <- nam1[,3]*5
> > return(mysum)
> > }
> > 
> > results <- ukn(dd1, "a", "b", nts$cda)
> > 
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained,
> reproducible code.
> > 
> 
> 
> 
>        
>
____________________________________________________________________________________
> Choose the right car based on your needs.  Check out


>