On 23.05.2010 16:14, Josef Leydold wrote:
Hi,
I am a little bit surprised by the following output of
'formals'. Is this the intended behavior?
f<- function(a=1,b=-1) { a+b }
class(formals(f)$a)
[1] "numeric"
class(formals(f)$b)
[1] "call"
Josef
Yes, the arguments have not yet been evaluated, hence -1 is still a
language object.
Try to write
f<- function(a= +1, b= -1) { a+b }
and you will find that this is a fascinating feature.
Uwe Ligges
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