[R] Two problems
David A Richmond
richmond at saintmarys.edu
Thu Apr 18 22:49:45 CEST 2002
On Thu, 18 Apr 2002, Ambrosini Alessandro wrote:
> Hello! Two questions:
>
> 1: I have to import a matrix of adjacency from a file of a software that is
> not R (for example "bloc notes" of Windows). The problem is that the matrix
> is not in the explicit form as
> 0 1 1
> 1 0 0
> 1 0 0
> but it is a scattered matrix where in each row there are two nodes that have
> a direct path.
> The matrix is
>
> a b
> a c
> b a
> c a
one more thing: here's how to read from a text file into a matrix of
strings so that you can use my charmatching solution:
> lines <- readLines("textfile.txt")
> lines
[1] "a b" "a c" "b a" "c a"
> chars <- c(strsplit(lines," "),recursive=TRUE)
> chars
[1] "a" "b" "a" "c" "b" "a" "c" "a"
> chars <- t(matrix(chars,2,length(chars)/2))
> chars
[,1] [,2]
[1,] "a" "b"
[2,] "a" "c"
[3,] "b" "a"
[4,] "c" "a"
>
dave r.
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