This may help in understanding how to access the list: notice that I
am using numeric indices and using the '[[' operator
> # generate a list with a varying number of values
> myList <- list() # initialize
> for (i in 1:10) myList[[i]] <- seq(i)
> myList
[[1]]
[1] 1
[[2]]
[1] 1 2
[[3]]
[1] 1 2 3
[[4]]
[1] 1 2 3 4
[[5]]
[1] 1 2 3 4 5
[[6]]
[1] 1 2 3 4 5 6
[[7]]
[1] 1 2 3 4 5 6 7
[[8]]
[1] 1 2 3 4 5 6 7 8
[[9]]
[1] 1 2 3 4 5 6 7 8 9
[[10]]
[1] 1 2 3 4 5 6 7 8 9 10
> myList[[4]] # 1,2,3,4
[1] 1 2 3 4
> myList[[4]][2:3] # 2, 3
[1] 2 3
>
On Wed, Apr 1, 2009 at 12:58 PM, Shawn Garbett
<shawn.p.garb...@vanderbilt.edu> wrote:
> I have a matrix of data. I need to scan the matrix and find every sequence
> from maxima to maxima across a row. I can write a loop to do this easily.
> Problem is, I can't figure out how to store the results. Each result is a
> vector of widely varying lengths. Ideally I'd like a vector of these, i.e. a
> vector of vectors, so I can quickly iterate through them and compute
> correlation coefficients.
>
> Here's a transcript of my fuddling to date:
>
>> x <- c(1,2,3)
>> y <- c(4,5)
>> v <- list("1"=x, "2"=y)
>> unlist(v["1"])
> 11 12 13
> 1 2 3
>> unlist(v["1"])[1]
> 11
> 1
>> unlist(v["1"])[2]
> 12
> 2
>> unlist(v["1"])[3]
> 13
> 3
>> unlist(v["2"])[3]
> <NA>
> NA
>> unlist(v["2"])[2]
> 22
> 5
>> v <- c(x,y)
>> v
> [1] 1 2 3 4 5
>> v <- vector()
>> v <- merge(v, x)
>> v
> [,1] [,2]
> attr(,"row.names")
> integer(0)
>> v[1]
> [1] NA
>>
>
> As you can see, vectors aren't very cooperative and lists are downright
> baffling to me.
>
> Shawn Garbett <shawn.p.garb...@vanderbilt.edu>
> Vanderbilt Cancer Biology
> 220 Pierce Ave, PRB 715AA
> Nashville, TN 37232
> Office: 615.936.1975
> Cell: 615.397.8737
>
> ______________________________________________
> R-help@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.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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