[R-sig-eco] Capture data

[Sargeant, Glen]

Here you go.

> a <- 1:3
> b <- 3:1
>
> idx <- as.matrix(expand.grid(b,a)[,c(2,1)])
>
> x <- c("A01", "B01", "C01", "A02", "B02", "C02", "A03", "B03", "C03")
>
> x[order(idx[,1],idx[,2])]
[1] "C01" "B01" "A01" "C02" "B02" "A02" "C03" "B03" "A03"


On Wed, Feb 8, 2017 at 2:43 PM, Allan Edelsparre <a.edelsparre at utoronto.ca>
wrote:

> Hi all,
>
> I have two data sets I want to merge. One has a vector with trap IDs and
> the vector from the other data set has the number of individuals captured
> at each trap site. I need to reverse the trap ID's within the trap ID
> vector in order to match the number trapped. Here is an example of how the
> vector looks like:
>
> TrapID
> A01
> B01
> C01
> A02
> B02
> C02
> A03
> B03
> C03
>
> I need the vector to look like this
>
> C01
> B01
> A01
> C02
> B02
> A02
> C03
> B03
> A03
>
> I can do the first chunk using this code:
>
> rev(TrapID[seq(1, 3)])
>
> I've tried several versions of this code including doing a for loop where
> I ran each sequence through, but it never worked. Any thoughts as to how I
> can do the reversal of a sequence within my vector???
>
> Allan
>
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>
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>


-- 
Glen Sargeant, Ph.D.
Research Wildlife Biologist/Statistician
USGS Northern Prairie Wildlife Research Center
E-mail: gsargeant at usgs.gov
Phone: (701) 253-5528

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