[R] Filtering a dataset's columns by another dataset's column names

[Rowe, Brian Lee Yung (Portfolio Analytics)]

Try this:

d1[,intersect(names(d1),names(d2))]

HTH, Brian

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Josh B
Sent: Friday, February 27, 2009 12:28 PM
To: R Help
Subject: [R] Filtering a dataset's columns by another dataset's column
names


Hello all,

I hope some of you can come to my rescue, yet again.

I have two genetic datasets, and I want one of the datasets to have only
the columns that are in common with the other dataset. 
Here is a toy example (my real datasets have hundreds of columns):

Dataset 1:

Individual    SNP1    SNP2    SNP3    SNP4    SNP5
1    A    G    T    C    A
2    T    C    A    G    T
3    A    C    T    C    A

Dataset 2:

Individual    SNP1    SNP3    SNP5    SNP6    SNP7
4    A    T    T    G    C
5    T    A    A    G    G
6    A    A    T    C    G

I want Dataset1 to have only columns that are also represented in
Dataset 2, i.e., I want to generate a new Dataset 3 that looks like
this:

Individual    SNP1    SNP3    SNP5
1    A    T    A
2    T    A    T
3    A    T    A

Does anyone know how I could do this? Keep in mind that this is not a
simple merge, as in the "merge" function.

Thanks very much for your help everyone.
Josh B.



      
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