Hello,
Your function declaration has a syntax error, one left parenthesis too
much. Corrected it would be
dummyfunction <- function(filters = function(x) {b = 0; x > b} ){
# rest of code here
filters # this returns a function, don't need return()
}
x <- -5:5
f <- dummyfunction() # this creates the default function
f(x)
g <- dummyfunction(mean) # this creates another function
g(x)
As you can see, you can use default functions as arguments in your
function declaration.
Hope this helps,
Rui Barradas
Em 24-01-2013 18:32, Jannis escreveu:
Dear R community,
I have a problem when I use functions as default values for argumnents
in other functions. When I use curly brackets { here, I can not create a
package with inlinedocs. It will give me the error when using
package.skeleton() in my package structure:
Error in parse(text = utxt) : <text>:4:0: unexpected end of input
For example:
dummyfunction = function(filters = function(x) {b = 0; x > b} ))
{
# rest of code here
return(filters)
}
This seems to me as a legal function declaration but creates the above
mentioned error. Is this an error of inlinedocs or do I misunderstand
the R language? Or is there another way of using functions in such a way
as arguments? In this case I could easily define this filters argument
inside the function for cases when it is not supplied as an argument but
I have some more complex functions where I really need to define
something sequential as an argument like:
dummyfunction = function(filters = {a = 1; b > a; b}) {print('test')}
I hope I could clarify my problem.
Thanks a lot
Jannis
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