[R] saveRDS() and readRDS() Why? [solved, pretty much anyway)

[Patrick Connolly]

The solution was very simple.  Don't use the same name for the rds
file  as used for the R object, viz a vie:

saveRDS(x, file = "x.rds")
and
x <- readRDS(file = "x.rds")

will not work; however

saveRDS(x, file = "y.rds")
and
x <- readRDS(file = "y.rds")
will work.

An undocumented feature?

Thanks to all who contributed.



On Sat, 10-Nov-2018 at 08:48PM +1300, Patrick Connolly wrote:

|> On Thu, 08-Nov-2018 at 11:06AM +0100, Martin Maechler wrote:
|> 
|> |> >>>>> Patrick Connolly 
|> |> >>>>>     on Thu, 8 Nov 2018 20:27:24 +1300 writes:
|> 
|> [...]
|> 
|> |> > 
|> |> > I still don't know Why, but I know How.
|> |> 
|> |> Hmm.. and nobody has been able to reproduce your problem, right?
|> |> 
|> |> IIUC, currently you are suggesting that [on Windows], if you do
|> |> 
|> |>       saveRDS(rawdata, file="rawdata.rds")
|> |> 
|> |> the resulting file is does not work with    readRDS()  on Linux.
|> |> What again are your R versions on the two platforms?
|> 
|> 
|> It's an old version on Windows.  I haven't used Windows R since then.
|> 
|> major          3                                          
|> minor          2.4                                        
|> year           2016                                       
|> month          03                                         
|> day            16                                         
|> 
|> 
|> I've tried R-3.5.0 and R-3.5.1 Linux versions.  The problem might be
|> entirely because of the ancient Windows version. 
|> 
|> 
|> |> 
|> |> Could you  dput() -- provide a (short if possible) version of rawdata where
|> |> that problem occurs ?
|> 
|> I can't make a smaller version of rawdata which comes from scraping a
|> non-public web address, but next week when I'm back where those
|> machines are, I'll try it with a small data frame which is
|> reproducible.
|> 
|> 
|> 
|> |> 
|> |> Best,
|> |> Martin
|> |> 
|> |> 
|> |> > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.   
|> |> >    ___    Patrick Connolly   
|> |> >  {~._.~}                   Great minds discuss ideas    
|> |> >  _( Y )_  	         Average minds discuss events 
|> |> > (:_~*~_:)                  Small minds discuss people  
|> |> >  (_)-(_)  	                      ..... Eleanor Roosevelt
|> |> > 	  
|> |> > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
|> |> > 
|> |> > ______________________________________________
|> |> > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
|> |> > https://stat.ethz.ch/mailman/listinfo/r-help
|> |> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
|> |> > and provide commented, minimal, self-contained, reproducible code.
|> 
|> -- 
|> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.   
|>    ___    Patrick Connolly   
|>  {~._.~}                   Great minds discuss ideas    
|>  _( Y )_  	         Average minds discuss events 
|> (:_~*~_:)                  Small minds discuss people  
|>  (_)-(_)  	                      ..... Eleanor Roosevelt
|> 	  
|> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
|> 
|> ______________________________________________
|> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
|> https://stat.ethz.ch/mailman/listinfo/r-help
|> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
|> and provide commented, minimal, self-contained, reproducible code.

-- 
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.   
   ___    Patrick Connolly   
 {~._.~}                   Great minds discuss ideas    
 _( Y )_  	         Average minds discuss events 
(:_~*~_:)                  Small minds discuss people  
 (_)-(_)  	                      ..... Eleanor Roosevelt
	  
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.