R help - Jun 2004 - .Traceback

Hi!

Is there a way to write the information stored in the .Traceback variable to a
file?

When I try it with dump()
".Traceback" <-
list("dump(.Traceback, file = \"Mytraceback.R\")") 

Or there are other ways to write this information on the disk if an error
occurs?

Eryk

"Wolski" <wolski at molgen.mpg.de> writes:
> Hi!
> 
> Is there a way to write the information stored in the .Traceback variable
to a file?
> 
> When I try it with dump()
> ".Traceback" <-
> list("dump(.Traceback, file = \"Mytraceback.R\")") 
> 
> Or there are other ways to write this information on the disk if an error
occurs?
You can assign it to a variable of a different name and save that. I
suspect that is the only way. E.g.,

  f <- function() foo()
  lm(y~x,data=f()) # lazy evaluation makes this interesting 
  x <- .Traceback
  dput(x) # or dump("x"), or save(), or....

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
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On Mon, 14 Jun 2004 16:38:48 +0200, "Wolski" <wolski at
molgen.mpg.de>
wrote :
>Hi!
>
>Is there a way to write the information stored in the .Traceback variable to
a file?
>
>When I try it with dump()
>".Traceback" <-
>list("dump(.Traceback, file = \"Mytraceback.R\")") 
>
>Or there are other ways to write this information on the disk if an error
occurs?
dump() is usually used when you want to recreate the object.  Here,
you probably just want to print it, so something like

sink('error.txt')
traceback()
sink()

might do a better job.  But if you really want the .Traceback list, I
think you just need to assign it to a new variable before dumping,
e.g.

saveTrace <- .Traceback
dump('saveTrace', 'whereever.R')

I imagine the problem you're having is from some special case code to
handle the .Traceback variable in a dump, but I haven't checked the
source to see.

Duncan Murdoch