[R] transpose lists

[D. Rizopoulos]

two possibilities are:

lis <- list(c(12.1,0.1,12.0,1.1), c(3.44,3.00,33.10,23.00))

# 1st
m <- do.call(rbind, lis)
split(m, col(m))

# 2nd
lapply(seq_along(lis[[1]]),
     function (i) sapply(lis, "[", i))


I hope it helps.

Best,
Dimitris


On 3/8/2013 11:06 AM, ishi soichi wrote:
> Thanks. The result should be a list of lists like...
>
>> x
> [[1]]
> [1] 12.10  3.44
>
> [[2]]
> [1] 0.1 3.0
>
> [[3]]
> [1] 12.0 33.1
>
> [[4]]
> [1]  1.1 23.0
>
> lapply(x, t) doesn't do the job, I think.
>
> ishida
>
>
> 2013/3/8 PIKAL Petr <petr.pikal at precheza.cz>
>
>> Hi
>>
>>> -----Original Message-----
>>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>>> project.org] On Behalf Of ishi soichi
>>> Sent: Friday, March 08, 2013 10:50 AM
>>> To: r-help
>>> Subject: [R] transpose lists
>>>
>>> Can you think of a function that transposes a list like
>>
>> What shall be the result of transposed list?
>>
>> Something like
>>
>> lapply(x, t)
>>
>> Regards
>> Petr
>>
>>>
>>>> x
>>> [[1]]
>>> [1] 12.1  0.1 12.0  1.1
>>>
>>> [[2]]
>>> [1]  3.44  3.00 33.10 23.00
>>>
>>> ?
>>>
>>> ishida
>>>
>>>        [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
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>>> PLEASE do read the posting guide http://www.R-project.org/posting-
>>> guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>

-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
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