Hi:

The problem, I'm guessing, is that you need to assign each of the matrices
to an object.
There's undoubtedly a slick apply family solution for this (which I want to
see, BTW!),
but here's the brute force method using a loop:

nms <- paste('x', 1:32, sep = "")
for(i in seq_along(nms)) assign(nms[i], x[[i]])

HTH,
Dennis

On Fri, Jan 29, 2010 at 6:30 AM, Muhammad Rahiz <
muhammad.rahiz@ouce.ox.ac.uk> wrote:

> Hello all,
>
> I'm trying to create a 2x2 matrix, 32 times after unlist() so that I can
> convert the list to matrix. I've looked through the R archive but couldn't
> find the answer. There is what I've done.
>
>
> > f <- system("ls *.txt", intern=TRUE)
> > x <- lapply(f, read.table)
> > x
> [[1]]
>    V1    V2
> 1 -27.3  14.4
> 2  29.0 -38.1
>
> [[2]]
>    V1   V2
> 1  14.4 29.0
> 2 -38.1 -3.4
>
> [[3]]
>   V1    V2
> 1 29.0 -38.1
> 2 -3.4  55.1
>
> [[4]]
>    V1   V2
> 1 -38.1 -3.4
> 2  55.1 -1.0
>
> [[5]]
>   V1   V2
> 1 -3.4 55.1
> 2 -1.0 21.9
>
> [[6]]
>   V1    V2
> 1 55.1  -1.0
> 2 21.9 -10.9
>
> ...
>
> > xx <- unlist(x)
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -27.3  29.0  14.4 -38.1  14.4 -38.1  29.0  -3.4  29.0  -3.4 -38.1  55.1
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -38.1  55.1  -3.4  -1.0  -3.4  -1.0  55.1  21.9  55.1  21.9  -1.0 -10.9
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -1.0 -10.9  21.9  -7.8  21.9  -7.8 -10.9 -48.2 -10.9 -48.2  -7.8 -44.9
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -7.8 -44.9 -48.2 -43.8 -48.2 -43.8 -44.9 -10.3 -44.9 -10.3 -43.8  44.2
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -43.8  44.2 -10.3  -0.5 -10.3  -0.5  44.2  96.7  44.2  96.7  -0.5 -32.0
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -0.5 -32.0  96.7  -0.2  96.7  -0.2 -32.0 -38.6 -32.0 -38.6  -0.2  73.6
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -0.2  73.6 -38.6 -17.5 -38.6 -17.5  73.6 -57.8  73.6 -57.8 -17.5  10.7
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -17.5  10.7 -57.8 -33.4 -57.8 -33.4  10.7  46.1  10.7  46.1 -33.4  26.7
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -33.4  26.7  46.1 -37.3  46.1 -37.3  26.7   1.2  26.7   1.2 -37.3  36.3
>  V11   V12   V21   V22   V11   V12   V21   V22   V11   V12   V21   V22
> -37.3  36.3   1.2  39.6   1.2  39.6  36.3  31.0  36.3 -27.3  39.6  14.4
>  V11   V12   V21   V22   V11   V12   V21   V22
> 39.6  29.0  31.0 -38.1  31.0  -3.4 -27.3  55.1
>
>
> The output should be
>
> [[1]]
>         [,1]      [,2]
> [1,]    -27.3    14.4
> [2,]     29.0    -38.1
>
> [[2]]
>          [,1]     [,2]
> [1,]      14.4    29.0
> [2,]     -38.1    -3.4
>
> [[3]]
>         [,1]     [,2]
> [1,]    29.0    -38.1
> [2,]    -3.4     55.1
>
> ...
> Thanks and much appreciated!
>
>
>
> Muhammad
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>

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