[R] R maintains old values

[Eric Berger]

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]]
> >
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> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> and provide commented, minimal, self-contained, reproducible code.
>

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