[R] Extract every 2 element for a list which are not equal in length

[Mohammad Tanvir Ahamed]

Hi Jim,
 
Thanks . Some how i have messed up mu lapply function.
Worked upon restart. 
 
Tanvir Ahamed 
Göteborg, Sweden   |  mashranga at yahoo.com 


----- Original Message -----
From: Jim Lemon <drjimlemon at gmail.com>
To: Mohammad Tanvir Ahamed <mashranga at yahoo.com>
Cc: R-help Mailing List <r-help at r-project.org>
Sent: Tuesday, 8 March 2016, 3:00
Subject: Re: [R] Extract every 2 element for a list which are not equal in length

Hi Tanvir,
I think what you want is:

lapply(e,"[",1)
lapply(e,"[",2)

Jim



On Tue, Mar 8, 2016 at 11:47 AM, Mohammad Tanvir Ahamed via R-help
<r-help at r-project.org> wrote:
> Hi,
>
> a <- c(1:5)b <- c(1:3)
> c <- 1
> d <- 5
> e <- list(a,b,c,d)
>
> # To extract every 1st element
> lapply(e,"[[",1)
>
> ## Out-put
> [[1]]
> [1] 1
>
> [[2]]
> [1] 1
>
> [[3]]
> [1] 1
>
> [[4]]
> [1] 5
>
> #To extract every 2nd element (Need help in this case)
> lapply(e,"[[",2)
>
> ## Expected outcome
> [[1]]
> [1] 2
>
> [[2]]
> [1] 2
>
> [[3]]
> [1] NA
>
> [[4]]
> [1] NA
>
>
>
> Any help will be appreciated . Thanks
>
>
> Tanvir Ahamed
> Göteborg, Sweden  |  mashranga at yahoo.com
>
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