Dear All.
I have some problem with combined two data frame.
....
I have first data frame ..

     GPAX THAI MATH SCINCE SOCIAL HEALT  ART CAREER LANGUAGE
1227 2.99 3.32 2.50   2.64   3.05  3.60 3.72   3.57     2.62
1704 2.81 2.56 2.48   2.86   3.22  3.19 3.55   3.20     2.51
617  2.18 1.90 1.97   2.06   2.38  3.50 3.54   2.33     1.70
876  2.82 3.14 2.73   2.46   2.71  3.11 3.04   3.24     2.90
1699 3.00 2.61 2.50   2.71   3.52  3.82 3.51   3.79     2.71
1054 2.64 2.94 2.00   2.35   3.05  3.81 3.59   2.98     1.99
31   2.73 2.86 2.34   2.57   3.03  3.35 3.24   3.18     2.24
164  2.74 2.95 2.10   2.64   2.82  3.51 3.33   3.32     2.37
1742 2.24 2.43 1.82   1.65   2.53  3.35 2.51   2.40     2.05
436  2.63 2.58 2.11   2.17   2.74  3.44 3.67   3.31     2.90
453  2.67 2.46 1.90   2.44   3.10  3.74 3.38   3.11     1.92

and second data frame

    GPAX THAI MATH SCINCE SOCIAL HEALT  ART CAREER LANGUAGE
156   NA 3.38 2.78   3.01   3.49  3.83 3.67   3.73     2.92

and y = 2.36

1. I want to replace NA with y in second data frame, how I can do.
2. I want to combined first and second data frame, how I can do.

Many Thanks
-- 
Jumlong Vongprasert Assist, Prof.
Institute of Research and Development
Ubon Ratchathani Rajabhat University
Ubon Ratchathani
THAILAND
34000

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