[R] error in exists.....

[akshay kulkarni]

Dear Sarah,
                     I had this also before the assignment of Sys.time():

>     E$L[[i]] <- i

After assignment of Sys.time():

> E$L
[[1]]
[[1]][[1]]
[1] 1

[[1]]$T1A1
[1] "2022-12-27 22:40:02 IST"

regrets for not sharing this ......Can you reproduce it now?

Thanking you,
Yours sincerely,
AKSHAY M KULKARNI
________________________________
From: Sarah Goslee <sarah.goslee using gmail.com>
Sent: Tuesday, December 27, 2022 11:20 PM
To: akshay kulkarni <akshay_e4 using hotmail.com>
Cc: R help Mailing list <r-help using r-project.org>
Subject: Re: [R] error in exists.....

Hi,

I can't create the desired object using the code you provided, but if
I create it in two steps so that E$L[[i]]$T1A1 does exist, exist()
returns TRUE.

E <- new.env()
E$L <- list()
i <- 1
E$L[[i]]$T1A1 <- Sys.time()

# returns: Error in `*tmp*`[[i]] : subscript out of bounds

E$L[[i]] <- list()
E$L[[i]]$T1A1 <- Sys.time()


exists("T1A1", where = E$L[[i]])
# returns: [1] TRUE


> str(E$L)
List of 1
 $ :List of 1
  ..$ T1A1: POSIXct[1:1], format: "2022-12-27 12:47:26"

Sarah

On Tue, Dec 27, 2022 at 12:36 PM akshay kulkarni <akshay_e4 using hotmail.com> wrote:
>
> Dear members,
>                              I have the following code:
> >  E <- new.env()
> >  E$L <- list()
> >  i <- 1
> >   E$L[[i]]$T1A1 <- Sys.time()
> > exists("T1A1", where = E$L[[i]])
> Error in list2env(list(1, T1A1 = 1672161002.38743), NULL, <environment>) :
>   attempt to use zero-length variable name
>
> I want the output of the exists() function to be TRUE. In any case:
>
> > E$L[[1]]$T1A1
> [1] "2022-12-27 22:40:02 IST"
>
> Please help me solve this conundrum....
>
> Thanking you,
> Yours sincerely,
> AKSHAY M KULKARNI
>
>
>         [[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.



--
Sarah Goslee (she/her)
http://www.numberwright.com

	[[alternative HTML version deleted]]