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

[Mohammad Tanvir Ahamed]

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

      From: Jorge I Velez <jorgeivanvelez 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, 3:04
 Subject: Re: [R] Extract every 2 element for a list which are not equal in length
   
Dear Mohammad,What's wrong with the result?Best,Jorge.-

On Monday, March 7, 2016, 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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-- 
Sent from my phone. Please excuse my brevity and misspelling. 


  
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