[R] on.exit

[Peter Dalgaard BSA]

kjetil halvorsen <kjetilh at umsanet.edu.bo> writes:

> but what should be better, doesnt work:
> 
> > test1 <- function() {
> +    oldwarn <- options("warn")
> +    options(warn=-1)
> +    on.exit( options(warn=oldwarn))
> +    log(-1)
> + }
> > test1()
> Error in options(...) : warn parameter invalid
> > 
> 
> 
> What is wrong? (I have tried other versions, without success)

oldwarn is a list. Try

> fix(test1)
>  test1()
[1] NaN
> test1
function() {
  oldwarn <- options("warn")
  options(warn=-1)
  on.exit( options(warn=oldwarn$warn))
  log(-1)
}

or maybe 

oldwarn <- unlist(options("warn")) 
... 
on.exit(options(warn=oldwarn))

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