[R] help - extract data using column names

[alex_123]

hello , I am new user in R . I have datafile (class = data.frame) which has
825 columns with unique column name i want extract 200 selected column from
datafile how can I do this?
my datafile look like..
            Mi         RBN         RBF        nDB         nX
3   2.6225979  0.53132756 -0.80599902 -1.4471864 -0.5705269
10  0.4818746 -1.72143092 -2.19579027  2.0118824 -0.5705269
12  2.8519611  1.88298265  0.09614617  0.6282549 -0.5705269
20  0.6347834 -0.36977583  0.63255683  1.3200687 -0.5705269


I want to extract data with unique name of column  , by  "Mi","RBF" etc . I
have stored character vector of desired column names. eg  aa =
c("Mi","RBF",..)





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