Changed behaviour when passing a function?

Of course (and unsurprisingly) Duncan is correct.  I see that behavior 
in R 3.1.0, as well as the modern ones Duncan mentioned.

What I said is true, as far as it goes, but the symbol being resolved 
is FUN, so when looking for a function it doesn't find the function 
version of round.

Did you perhaps have a function named FUN in your global environment? 
If so you are being bitten by what I mentioned before.

FUN = function(...) 1
myfun <- function(x, FUN, ...){

+      FUN(x, ...)
+ }

round <- 2
myfun(0.85, FUN = round, digits=1)

[1] 1

~G

On Thu, Oct 22, 2015 at 2:25 PM, Duncan Murdoch 
<murdoch.duncan at gmail.com <mailto:murdoch.duncan at gmail.com>> wrote:

    On 22/10/2015 1:59 PM, Joris Meys wrote:

        Hi all,

        When teaching this year's class, I was quite amazed that one
        of my examples
        didn't work any longer. I wanted to illustrate the importance of
        match.fun() with following code:

        myfun <- function(x, FUN, ...){
             FUN(x, ...)
        }
        round <- 2
        myfun(0.85, FUN = round, digits=1)

        I expected to see an error, but this code doesn't generate
        one. It seems as
        if in the current R version match.fun() is added automatically.

        I've scrolled through the complete R News section specifying
        all the
        changes and bug fixes, starting from 3.0.0.  I couldn't find
        anything on
        that change in behaviour though. Where can I find more
        information on what
        changed exactly?


    When you say "current R version", what do you mean?  I see an error:

    > myfun <- function(x, FUN, ...){

    +     FUN(x, ...)
    + }

    > round <- 2
    > myfun(0.85, FUN = round, digits=1)

    Error in myfun(0.85, FUN = round, digits = 1) (from #2) :
      could not find function "FUN"

    I see this in 3.2.2, R-patched and R-devel.

    Duncan Murdoch