[R] error in exists.....

[Sarah Goslee]

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