[R] Presence/ absence data from matrix to single column

Rui Barradas ruipbarradas at sapo.pt
Sun Oct 7 20:32:51 CEST 2012


I haven't been following this thread but apparently the answer to your 
worries is no.
You can use a combination of names() and grep() to sort it out. 
something like

#nms <- names(adat)
nms <- c("Year", "Route", "Point", paste0("Sp", 1:250))

pattern <- "^Sp[[:digit:]]+$"
whichCols <- grep(pattern, nms)
whichNames <- nms[whichCols]

reshape(..., varying = whichCols, times = whichNames, ...)

Hope this helps,

Rui Barradas
Em 07-10-2012 15:35, agoijman escreveu:
> The problem with that, is that I just wrote an example of my database, but I
> have around 250 species and more than 500 sites. In the approach you show
> me, it looks like I have to enter every species name and sites individually,
> right?
> --
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