[R] a little problem on selecting a subset from dataset A according to dataset B?

Dear Friends, I want to extract the records from A according to B, but the results are not correct because R says : The length of long object is not integer times on the length of short object. Anybody have met the same problem? How to do it correctly? length(A)=47 length(B)=6

Re: [R] a little problem on selecting a subset from dataset A according to dataset B?

zhijie zhang wrote: Dear Friends, I want to extract the records from A according to B, but the results are not correct because R says : The length of long object is not integer times on the length of short object. Anybody have met the same problem? How to do it correctly?