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

[akshay kulkarni]

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
>
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>
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