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

[Heinz Tuechler]

Did you consider to look at the help page for merge?
h

At 22:01 13.01.2010, 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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