[R] merging issue.........

[Pete B]

Try the merge function
?merge

in1 = "id trait1 
1    10.2 
2    11.1 
3    9.7 
6    10.2 
7    8.9 
10  9.7 
11  10.2 
"

in2 = "id trait2 
1     9.8 
2     10.8 
4     7.8 
5     9.8 
6     10.1 
12    10.2 
13    10.1
" 

data1 = read.table(textConnection(in1), header=T)
data2 = read.table(textConnection(in2), header=T)

mymerge = merge(data1,data2,all.x=TRUE)
print(mymerge)



karena wrote:
> 
> hi, I have a question about merging two files.
> For example, I have two files, the first file is like the following:
> 
> id   trait1
> 1    10.2
> 2    11.1
> 3    9.7
> 6    10.2
> 7    8.9
> 10  9.7
> 11  10.2
> 
> The second file is like the following:
> id    trait2
> 1     9.8
> 2     10.8
> 4     7.8
> 5     9.8
> 6     10.1
> 12    10.2
> 13    10.1
> 
> now I want to merge the two files by the variable "id", I only want to
> keep the "id"s which show up in the first file. Even the "id" does not
> show up in the second file, it doesn't matter, I can keep the missing
> values. So my question is: how can I merge the two files and keep only the
> rows whose "id" show up in the first file?
> I know how to do it is SAS, just use the following code: 
> merge data1(in=in1) data2(in=in2);
> by id;
> if in1;
> 
> but I really have no idea about how to do it in R.
> 
> thank you in advance,
> 
> karean 
> 

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