[R] ?? hmm ??

[Warnes, Gregory R]

To add to the other answers, 
  1) Normally, the last statement in a function determines its return value.
  2) Normally, when a function returns to the top level (the ">" prompt),
its value is printed by calling print().

Thus your function returns the value of "m", which gets printed when it
returns to the top level.  To see the value of "x", you can either return it
and the value of "m" by changing the last line to "return(x,m)", or you can
call "print(x)" inside the function.

-Greg
 

-----Original Message-----
From: Gerard.Keogh at cso.ie [mailto:Gerard.Keogh at cso.ie]
Sent: Monday, September 10, 2001 11:18 AM
To: r-help at hypatia.math.ethz.ch
Subject: [R] ?? hmm ??


Hello again!
thanks to all who helped with overlay plots - v.  easy in the end.

Anyway, another new(ba)bee type question - the gurus will cringe I'm sure!

Q. simple R function
mm <- function (u) {
  x <- u$GDP
  x
  m <- mean(x)
  m
}

When the function is called the vector "x" does not get printed from within
the function, but the mean value "m" does, why?
I think it's probably to do with scoping but don't really know.
The vector "x" can of course be printed with the print function so there no
problem seeing it for program debugging etc.

Thanks in advance.

Gerard Keogh

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