使用来自不同数据帧的信息子集数据[r]

Question

I have two data frames. One contains a large amount of data. The second contains a smaller amount of data with some matching row names.

data frame A
Row.names  data
    1       A
    2       B
    3       C
    4       D
    5       E

data frame B
Row.names  data
    1       X
    3       Y
    5       Z

I want to extract the data from data frame A using the row.names from data frame B to create:

data frame C
Row.names   data
    1        A
    3        C
    5        E

I basically want to use to row names from data frame B to subset data from data frame A that has the exact same row names.

Any help would be appreciated.

Answer 1

Did you try A[rownames(B),] ?? (I am assuming that you are really referring to row names, not to columns called "Row.names")