Hi all,

I have two dataframes. The first (A) contains all the stock prices for
today including today. So the first column is the stock Symbol and the
second column is the stock price. The second (B) is the symbol list in the
top 100 stocks.

I want to pick out from dataframe A only the rows containing the symbols
from B. i.e. something like:

            prices <- A[A[,1]==B,2]

is there any way to do this without using a for loop, I have to do this 365
times (i.e. for one year).

Thanks,
Sachin

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