[R] saveRDS() and readRDS() Why?

[Eric Berger]

Your understanding is correct. It works fine for me.

On Wed, Nov 7, 2018 at 10:48 AM Patrick Connolly <p_connolly using slingshot.co.nz>
wrote:

> On Wed, 07-Nov-2018 at 08:27AM +0000, Robert David Burbidge wrote:
>
> |> Hi Patrick,
> |>
> |> From the help: "save writes a single line header (typically
> |> "RDXs\n") before the serialization of a single object".
> |>
> |> If the file sizes are the same (see Eric's message), then the
> |> problem may be due to different line terminators. Try serialize and
> |> unserialize for low-level control of saving/reading objects.
>
> I'll have to find out what 'serialize' means.
>
> On Windows, it's a huge table, looks like it's all hexadecimal.
>
> On Linux, it's just the text string 'rawData' -- a lot more than line
> terminators.
>
> Have I misunderstood what the idea is?  I thought I'd get an identical
> object, irrespective of how different the OS stores and zips it.
>
>
>
> |>
> |> Rgds,
> |>
> |> Robert
> |>
> |>
> |> On 07/11/18 08:13, Eric Berger wrote:
> |> >What do you see at the OS level?
> |> >i.e. on windows
> |> >DIR rawData.rds
> |> >on linux
> |> >ls -l rawData.rds
> |> >compare the file sizes on both.
> |> >
> |> >
> |> >On Wed, Nov 7, 2018 at 9:56 AM Patrick Connolly <
> p_connolly using slingshot.co.nz>
> |> >wrote:
> |> >
> |> >> From a Windows R session, I do
> |> >>
> |> >>>object.size(rawData)
> |> >>31736 bytes  # from scraping a non-reproducible web address.
> |> >>>saveRDS(rawData, file = "rawData.rds")
> |> >>Then copy to a Linux session
> |> >>
> |> >>>rawData <- readRDS(file = "rawData.rds")
> |> >>>rawData
> |> >>[1] "rawData"
> |> >>>object.size(rawData)
> |> >>112 bytes
> |> >>>rawData
> |> >>[1] "rawData" # only the name and something to make up 112 bytes
> |> >>Have I misunderstood the syntax?
> |> >>
> |> >>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.
> |> >>
> |> >>In case it's material ...
> |> >>
> |> >>I couldn't get the scraping to work on either of the R installations
> |> >>but Windows users told me it worked for them.  So I thought I'd get
> |> >>the R object and use it.  I could understand accessing the web address
> |> >>could have different permissions for different OSes, but should that
> |> >>affect the R objects?
> |> >>
> |> >>TIA
> |> >>
> |> >>--
> |>
> >>~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
> |> >>    ___    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.
> |> >>
> |> >    [[alternative HTML version deleted]]
> |> >
> |> >______________________________________________
> |> >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.
>

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