[R] merge two vectors of the same length into one?
Duncan Murdoch
murdoch at stats.uwo.ca
Sun Mar 26 18:39:51 CEST 2006
On 3/26/2006 11:26 AM, Zhiqiang Ye wrote:
> Dear all,
>
> I have a question about merge two character vectors of the same
> length into one.
>
> For example:
>
> X= c('A', 'B', 'C', 'A', 'D', .......) # 26 possible
> alphabet values with length 1000
> Y=c('B', 'A', 'C', 'A', 'C', ........) # 26 possible
> aphabet values with length 1000
>
> after using table ( X,Y ), I will get a matrix of 26*26. But I
> want to sort these values from large to small, that is to say, I want
> to get an output like this;
>
> AB 75
> AC 60
> CC 58
> ....
>
> How can I get this kind of output?
I am not sure I understand what you want (e.g. I would have expected to
see BA in your list).
But you can get the table of pairs via
table(paste(X, Y, sep=""))
and you can sort it if you want, e.g.
> X= c('A', 'B', 'C', 'A', 'D', 'A')
> Y= c('B', 'A', 'C', 'A', 'C', 'B')
> table(paste(X,Y,sep=""))
AA AB BA CC DC
1 2 1 1 1
> sort(table(paste(X,Y,sep="")), dec=TRUE)
AB AA BA CC DC
2 1 1 1 1
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