[no subject]

[Cavenaugh <sjcav@aros.net>]

Hi,

        I have two data frames X and Y, X is as the following:

                Column1         Column2 Column3
                   1                       a             X1
                   2                       a                X2
                   3                       a               X3
                   1                       b               X4
                   2                       b               X5
                   3                       b               X6

        Data frame Y is as the following

                Column1         Column2 Column3
                   1                       a               Y1
                   3                       b               Y2

I want to compare column1 and column2 of data frame X and Y. When the
elements in both columns in the two data frames are the same, I want to use
the content in column3 of Y to replace the corresponding one in column3 of
data frame X.  The results of the above example should look as the following:

                Column1         Column2 Column3
                   1                       a             Y1
                   2                       a                X2
                   3                       a               X3
                   1                       b               X4
                   2                       b               X5
                   3                       b               Y2

Thanks for your help in advance.

---Sharon



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