Capture data

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])]

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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