[R] Fwd: List of lists ?

[Carlos Petti]

---------- Forwarded message ----------
From: Carlos Petti <carlos.petti at gmail.com>
Date: 2010/8/10
Subject: Re: [R] List of lists ?
To: David Winsemius <dwinsemius at comcast.net>


Thanks for answer.

I read the error messages but I did not find the solution :-(

Your solution works.
But, a new problem remains because I want
to use the list of lists as follows :

x <- list(list())

x[[2]][[1]] <- c(1, 2, 3)
x[[2]][[2]] <- c(3, 2, 1)

Thanks in advance,
Carlos

2010/8/9 David Winsemius <dwinsemius at comcast.net>:
>
> On Aug 9, 2010, at 12:57 PM, Carlos Petti wrote:
>
>> Dear list,
>>
>> I have to use a list of lists containing vectors.
>>
>> For instance :
>>
>> [[1]]
>> [[1]][[1]]
>> [1] 1 2 3
>>
>> [[1]][[2]]
>> [1] 3 2 1
>>
>> I want to attribute vectors to the main list
>>
>> without use of an intermediate list,
>>
>> but it does not work :
>
> More specifically it produces an error that has information in it.
>> x[[1]][[1]] <- c(1, 2, 3)
> Error in `*tmp*`[[1]] : subscript out of bounds
>
>>
>> x <- list()
>> x[[1]][[1]] <- c(1, 2, 3)
>> x[[1]][[2]] <- c(3, 2, 1)
>
> So thinking perhaps we just needed another level of subscripting "available"
> I tried:
>
>> x <- list(list())
>> x[[1]][[1]] <- c(1, 2, 3)
>> x[[1]][[2]] <- c(3, 2, 1)
>> x
> [[1]]
> [[1]][[1]]
> [1] 1 2 3
>
> [[1]][[2]]
> [1] 3 2 1
>
> Success. Moral: Read the error messages for meaning or at least clues.
> (Further testing showed that almost anything inside the original list()
> call, even NULL,  would have created enough structure for the interpreter to
> work with.
>
>>
>
> David Winsemius, MD
> West Hartford, CT
>
>