r - How to transfer variable value from one dataframe to another dataframe by two conditions? -


i have 2 data follows. want transfer value of change in first dataframe second dataframe date , code.

>     date       code            change  1 2013-12-27 000586 0.990099012851715  2 2013-12-26 000616  9.97067451477051  3 2013-12-25 300295  10.0013799667358  4 2013-12-23 000968  -8.1564245223999  5 2013-12-19 600023  60.5786628723145  6 2013-12-18 600855 -7.69696950912476  > b       code    date       company  1 000586 2013-12-27        2 000616 2013-12-26       b  3 300295 2013-12-25       c  4 000968 2013-12-23       d  5 600023 2013-12-19        6 600023 2013-12-19       b  7 600855 2013-12-18       c

the final result should like:

> c       code       date company change 1 000586 2013-12-27          0.990099012851715 2 000616 2013-12-26       b      9.97067451477051 3 300295 2013-12-25       c     10.0013799667358 4 000968 2013-12-23       d      -8.1564245223999 5 600023 2013-12-19           60.5786628723145 6 600023 2013-12-19       b     60.5786628723145 7 000586 2013-12-27       b      0.990099012851715

how can this?

instead of creating new dataframe, can add new column b dataframe match:

b$change <- a$change[match(b$code,a$code)]

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