inconsistency in switch statements.....
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 at 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 at gmail.com>
Sent: Thursday, September 8, 2022 12:39 AM
To: akshay kulkarni <akshay_e4 at hotmail.com>
Cc: R help Mailing list <r-help at 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 at 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]]
______________________________________________
R-help at 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 at 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.