[R] inconsistency in switch statements.....

[Richard O'Keefe]

You DON'T need to use backticks.  switch() is much older than backticks.
Ordinary quotation marks are fine.
> switch(as.character(1), "2"="YES", "1"="NO")
[1] "NO"


On Thu, 8 Sept 2022 at 07:46, akshay kulkarni <akshay_e4 using hotmail.com> wrote:

> Dear Bert,
>                     Thanks...I went through the doc pages but couldn't
> glean from that that for numeric options one has to backtick it. I is not
> given in the doc page...I actually had hundreds of different choices and so
> cannot depend on evaluation by position...Thanks again...I got to know that
> 2 is not a valid identifier but`2` is!
>
> Yours sincerely,
> AKSHAY M KULKARNI
>
> ________________________________
> From: Bert Gunter <bgunter.4567 using gmail.com>
> Sent: Thursday, September 8, 2022 12:39 AM
> To: akshay kulkarni <akshay_e4 using hotmail.com>
> Cc: R help Mailing list <r-help using r-project.org>
> Subject: Re: [R] inconsistency in switch statements.....
>
> Well, as it states on the Help page, which should always be the first
> place to look for, ummm, help:
>
> "If the value of EXPR is not a character string it is coerced to
> integer. Note that this also happens for factors, with a warning, as
> typically the character level is meant. If the integer is between 1
> and nargs()-1 then the corresponding element of ... is evaluated and
> the result returned: thus if the first argument is 3 then the fourth
> argument is evaluated and returned."
>
> So following up on Bill's comment, the arguments do not even need to
> be names when Stst evaluates to) an integer:
>
> > Stst <- 2
> > switch(Stst, print("NO"), print("YES"))
> [1] "YES"
>
> Cheers,
> Bert
>
> On Wed, Sep 7, 2022 at 11:35 AM akshay kulkarni <akshay_e4 using hotmail.com>
> wrote:
> >
> > Dear members,
> >                              The following is my code:
> >
> > > Stst <- 2
> > > switch(Stst, 1 = print("NO"), 2 = print("YES"))
> > Error: unexpected '=' in "switch(Stst, 1 ="
> >
> > Why isn't it printing "YES" on to the console?
> >
> > many thanks in advance.
> >
> > Thanking you,
> > Yours sincerely,
> > AKSHAY M KULKARNI
> >
> >         [[alternative HTML version deleted]]
> >
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> 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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