try this; added an extra row so that the lengths would not be even:
> x <- read.table(textConnection(" spl_A spl_B spl_C
+ spcs1 1 1 0
+ spcs2 1 0 1
+ spcs3 0 1 1
+ spcs4 0 0 1"), header = TRUE)
> closeAllConnections()
> x
spl_A spl_B spl_C
spcs1 1 1 0
spcs2 1 0 1
spcs3 0 1 1
spcs4 0 0 1
>
> # get maximum in any column so we can pad out the lengths
> maxLen <- max(colSums(x))
>
>
> combine <- lapply(x, function(.col){
+ sp <- row.names(x)[.col == 1]
+ c(sp, rep("", maxLen - length(sp)))
+ })
>
> do.call(cbind, combine)
spl_A spl_B spl_C
[1,] "spcs1" "spcs1" "spcs2"
[2,] "spcs2" "spcs3" "spcs3"
[3,] "" "" "spcs4"
>
On Fri, Apr 22, 2011 at 2:10 PM, antu <ananta.acha...@gmail.com> wrote:
> this thread
> (http://r.789695.n4.nabble.com/how-to-combine-presence-only-data-sets-to-one-presence-absence-table-td830140.html
> ) covered the need for making present list list to a matrix,
>
> Now, I ran into an opposite problem. I have a data matrix with 0, 1 on them,
> what I need now is list of presence only for each column name
>
> ie, this is what I have
>
> spl_A spl_B spl_C
> spcs1 1 1 0
> spcs2 1 0 1
> spcs3 0 1 1
>
>
> this is what I need
>
> spl_A spl_B spl_C
> spcs1 spcs1 spcs2
> spcs2 spcs3 spcs3
>
>
>
> Thank you
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Convert-a-presence-absence-matrix-to-a-list-of-presence-only-tp3468479p3468479.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@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.
>
--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
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