[R] Problems saving ff objects

[Jannis]

Just did some more testing.....May the problem be due to the fact that I am using a windows machine? I just ran the same code on a Linux machine and everything worked fine.

If windows (or the file system of the disk) caused the problem, is there any way to resolve it? I know that using Linux would be a better choice ;-) but unfortunatley this in no option at the moment....


Best
Jannis

--- Jannis <bt_jannis at yahoo.de> schrieb am Mi, 4.5.2011:

> Von: Jannis <bt_jannis at yahoo.de>
> Betreff: [R] Problems saving ff objects
> An: r-help at r-project.org
> Datum: Mittwoch, 4. Mai, 2011 13:17 Uhr
> Dear list,
> 
> 
> I am trying to understand and use the ff package. As I had
> some problems saving some ff objects, and as I did not fully
> manage to understand the whole concept of *.ff, *.ffData and
> *.RData with the help of the documentation, I tried to
> reproduce the examples from the help of ffsave.
> 
> When I ran, however : (copied from the help)
> 
>  message("let's create some ff objects")
>   n <- 8e3
>   a <- ff(sample(n, n, TRUE), vmode="integer",
> length=n, filename="d:/tmp/a.ff")
>   b <- ff(sample(255, n, TRUE), vmode="ubyte",
> length=n, filename="d:/tmp/b.ff")
>   x <- ff(sample(255, n, TRUE), vmode="ubyte",
> length=n, filename="d:/tmp/x.ff")
>   y <- ff(sample(255, n, TRUE), vmode="ubyte",
> length=n, filename="d:/tmp/y.ff")
>   z <- ff(sample(255, n, TRUE), vmode="ubyte",
> length=n, filename="d:/tmp/z.ff")
>   df <- ffdf(x=x, y=y, z=z)
>   rm(x,y,z)
> 
>   message("save all of them")
>   ffsave.image("d:/tmp/x")
> 
> I get:
> 
> Error in ffsave(list = ls(envir = .GlobalEnv, all.names =
> TRUE), file = outfile,  : 
>   the previous files do not match the rootpath (case
> sensitive)
> 
> 
> Whats wrong here? Should this not be working as I did not
> change anything in the code?
> 
> 
> 
> Cheers
> Jannis
> 
> 
> > sessionInfo()
> R version 2.12.0 (2010-10-15)
> Platform: i386-pc-mingw32/i386 (32-bit)
> 
> locale:
> [1] LC_COLLATE=English_United States.1252 
> [2] LC_CTYPE=English_United States.1252   
> [3] LC_MONETARY=English_United States.1252
> [4] LC_NUMERIC=C           
>               
> [5] LC_TIME=English_United States.1252    
> 
> attached base packages:
> [1] tools     stats 
>    graphics  grDevices utils 
>    datasets  methods  
> [8] base     
> 
> other attached packages:
> [1] ff_2.2-2   bit_1.1-7  rj_0.5.2-1
> 
> loaded via a namespace (and not attached):
> [1] rJava_0.8-8
> 
> 
> 
> 
> ______________________________________________
> R-help at r-project.org
> mailing list
> 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.
>