[R] Combine two tables by row with different columns

[R. Michael Weylandt]

Just omit "Z" when you combine T1 and T2 -- incidentally, dput() is an
even easier way to make a reproducible example (and you don't need
rep() for your rownames since you arent repeating anything)

T1 <- structure(1:16, .Dim = c(4L, 4L), .Dimnames = list(c("A", "B",
"C", "D"), c("X", "Y", "Z", "XX")))

T2 <- structure(1:9, .Dim = c(3L, 3L), .Dimnames = list(c("A1", "B1",
"C1"), c("X", "Y", "XX")))

It sounds like you want to get the intersection of the colnames for
your combined object so something like:

cn <- intersect(colnames(T1), colnames(T2))

rbind(T1[, cn], T2[, cn])
# I think David misread -- it sounds like you want rbind here

Hope this helps,
Michael

On Wed, May 9, 2012 at 10:04 PM, Kristi Glover
<kristi.glover at hotmail.com> wrote:
>
> Thanks David,
> I tried 'cbind" as you suggested: but did not work. Here are the example
>
>> T1=matrix(1:16, ncol=4)
>> rownames(T1)=rep(c("A","B","C","D"))
>> colnames(T1)=rep(c("X","Y","Z","XX"))
>> T2=matrix(1:9, ncol=3)
>> rownames(T2)=rep(c("A1","B1","C1"))
>> colnames(T2)=rep(c("X","Y","XX"))
>> T1
>  X Y  Z XX
> A 1 5  9 13
> B 2 6 10 14
> C 3 7 11 15
> D 4 8 12 16
>> T2
>   X Y XX
> A1 1 4  7
> B1 2 5  8
> C1 3 6  9
>> T1T2<-cbind(T1,T2)
> Error in cbind(T1, T2) :
>  number of rows of matrices must match (see arg 2)
>
> I want to have the following table (probably you noticed that column Z in Table 1 is not in Table 2)
>
> X Y  XX
> A 1 5 13
> B 2 6 14
> C 3 7 15
> D 4 8 16
> A1 1 4  7
> B1 2 5  8
> C1 3 6  9
>
> any suggestions? this is just an example, I have very big files (~1700 columns, and ~2500 rows)
>
> Kristi
>
>
>
>> CC: r-help at r-project.org
>> From: dwinsemius at comcast.net
>> To: kristi.glover at hotmail.com
>> Subject: Re: [R] Combine two tables by row with different columns
>> Date: Wed, 9 May 2012 21:47:48 -0400
>>
>>
>> On May 9, 2012, at 9:21 PM, Kristi Glover wrote:
>>
>> >
>> > Hi R user,
>> > I could not combine two tables. Would any one help me on how I can
>> > combine with following example tables?
>>
>> You do realize that tables in R are not dataframes. They are a type of
>> matrix.
>>
>> >
>> >> T1
>> >  X Y  Z XX
>> > A 1 5  9 13
>> > B 2 6 10 14
>> > C 3 7 11 15
>> > D 4 8 12 16
>> >
>> >> T2
>> >   X Y XX
>> > a 1 4  7
>> > b 2 5  8
>> > c 3 6  9
>> >
>> > I want to get the following table
>> > cT
>> >   X Y XX
>> > A 1 5  13
>> > B 2 6  14
>> > C 3 7 15
>> > D 4 8 16
>> > A1 1 4  7
>> > B1 2 5  8
>> > C1 3 6  9
>>
>> Assuming you will accept the rownames as they stand, then try this:
>>
>> cT <- cbind(T1,T2)   # works for table, matrices, and dataframes
>>
>> >
>> >     [[alternative HTML version deleted]]
>> Plain text, please.
>>
>> --
>> David Winsemius, MD
>> West Hartford, CT
>>
>
>        [[alternative HTML version deleted]]
>
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