From Setzer.Woodrow@epamail.epa.gov  Thu Mar  8 19:30:33 2001
From: Setzer.Woodrow@epamail.epa.gov (Setzer.Woodrow@epamail.epa.gov)
Date: Thu, 08 Mar 2001 14:30:33 -0500
Subject: [Rd] surprising behavior of match.arg() (PR#872)
Message-ID: <OFBFFAD3E9.4E8693DA-ON85256A09.006ADE75@rtp.epa.gov>


So, in my toy example, when I add the line Fun <- Fun after the first
invocation of Fun(), Fun finds the default args when invoked a second time.
That gives me an easy work around for the real problem where I encountered
this.  Thanks.

R. Woodrow Setzer, Jr.                                            Phone:
(919) 541-0128
Experimental Toxicology Division                       Fax:  (919) 541-5394
Pharmacokinetics Branch
NHEERL MD-74; US EPA; RTP, NC 27711


                                                                                                                  
                    Peter Dalgaard                                                                                
                    BSA                     To:     Woodrow Setzer/RTP/USEPA/US@EPA                               
                    <p.dalgaard@bios        cc:     r-devel@stat.math.ethz.ch, R-bugs@biostat.ku.dk               
                    tat.ku.dk>              Subject:     Re: [Rd] surprising behavior of match.arg() (PR#872)     
                    Sent by:                                                                                      
                    pd@pubhealth.ku.                                                                              
                    dk                                                                                            
                                                                                                                  
                                                                                                                  
                    03/08/01 01:43                                                                                
                    PM                                                                                            
                                                                                                                  
                                                                                                                  




Setzer.Woodrow@epamail.epa.gov writes:

> If a function needs to be passed as an argument to another function,
> default arguments to the function being passed are lost.  Consider this
> example:

Interesting...

Apparently, sys.function() is still a promise after the  function has
been called (and the promise obviously forced).
Minimal example of same effect:

> f<-function()sys.function()
> f()
function()sys.function()
> g<-delay(f)
> g()
<promise: 0x8b248b4>
> g<-g
> g()
function()sys.function()


--
   O__  ---- Peter Dalgaard             Blegdamsvej 3
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907




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[Rd] surprising behavior of match.arg() (PR#872)
Setzer.Woodrow@epamail.epa.gov