[R] match problem

Bunny, lautloscrew.com
Tue, 15 Dec 2009 12:50:46 -0000

Hi all,

I dont know if match is the right approach here. I?d like to match to
data.frames. One big dataframe and one small dataframe. In SQL, what i want to
do what only be simple relation.

The first consists of two columns a) some value b) some key that is explained in
the other dataframe. What i want to do is create (cbind) both to one dataframe
like:

df1:

a  b
1  2
2  3
3  2
4  2
5  1

df2:
1 class1
2 class2
3 class3


to newdf:

a b class
1 2 class2
2 3 class3
3 2 class2
...
and so forth

I have connected R to several relational databases but I dont think it?s
necessary here and that there should be a simpler solution for my problem. Maybe
some combination of do.call, mapply, lapply or match can do the job.
Unfortunately I am not really familiar with these and still keep tryin.

thx in advance for any help.

Best regards

matt