[R] R maintains old values

[Bert Gunter]

... or perhaps

rm( list = ls(all = TRUE))
## see ?ls  for details.

However, see ?Startup for how to start a R in a "clean" environment, e.g.
with the --no-restore option.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Mon, Jul 2, 2018 at 7:47 AM, Eric Berger <ericjberger using gmail.com> wrote:

> If you want a "fresh" R session when you start to run the script you could
> consider putting as the first line
>
> rm(list=ls())
>
> This will remove objects from your environment (variables, functions, ..)
>
> HTH,
> Eric
>
>
> On Mon, Jul 2, 2018 at 5:34 PM, PIKAL Petr <petr.pikal using precheza.cz> wrote:
>
> > Hi
> >
> > Without code it is just fishing in murky waters. Could the problem you
> > face be that in each run you assingn the result to some object and if the
> > CSV is wrong your code fails but the object from previous run persists?
> >
> > If this is the case just initialize your objects in the beginning (e.g.
> > make them NULL at the beginning) and only if code delivers result the
> value
> > of the result is returned otherwise NULL is returned.
> >
> > Cheers
> > Petr
> >
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> >
> > > -----Original Message-----
> > > From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Morkus
> > via R-
> > > help
> > > Sent: Monday, July 2, 2018 2:02 PM
> > > To: r-help using r-project.org
> > > Subject: [R] R maintains old values
> > >
> > > Hello,
> > >
> > > I have a strange side-effect from executing R-scripts using R and
> RServe.
> > >
> > > I am executing an R-Script from a Java file using RServe in R. I also
> > have RStudio
> > > installed, but it's not running at the time. The R-script reads a CSV
> > file and does
> > > various statistical things. RServe enables me to run each line of the R
> > script
> > > using "eval()" line by line.
> > >
> > > All this works fine for a correctly-formatted CSV file. It's great.
> > >
> > > But, if the CSV file isn't correctly formatted, AND the last CSV file
> > did correctly
> > > get run, then, with the incorrect CSV as input, the output is what ran
> > last time.
> > > Somehow, the last correct run is persisted and returned if there is
> some
> > > problem with the current CSV input.
> > >
> > > This data persistence is maintained across reboots.
> > >
> > > I'm thus baffled how R is maintaining these old values, but more to the
> > point, I
> > > need to know how to clear these old values so if the CSV input is
> > incorrect, I get
> > > nothing back, not the old CSV values from a correctly formatted file.
> > >
> > > Hope this description is clear.
> > >
> > > Thanks in advance to all.
> > >
> > > - M
> > >
> > > Sent from [ProtonMail](https://protonmail.com), Swiss-based encrypted
> > email.
> > >       [[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.
> >
> > ______________________________________________
> > 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.
>

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