[R] mean for each row

[Hesen Peng]

How about rowSums(x)/ncol(x), where x is the matrix?


On Mon, Mar 17, 2008 at 1:48 PM, Roslina Zakaria <zroslina at yahoo.com> wrote:
>   Hi r-users,
>  How do find the mean for each row? Thank you in advance for your help.
>
>
>           1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 Day Totals
>  1            0.0  0.0  0.0  0.0  0.6  0.0  8.4  0.0 29.4  0.0       38.4
>  2            0.0  0.0  1.8  0.0 22.4  0.0  0.2  0.4  0.8  0.0       25.6
>  3            7.8  0.0  0.0 17.6  1.4  0.0  0.0  0.0  0.0  0.0       26.8
>  4            2.2  0.8  0.4  0.0  0.2 11.2  1.4 33.2  0.0  0.0       49.4
>  5            0.2  1.8  0.0  1.0  0.0  0.2  0.0 12.2  0.0 19.2       34.6
>  6            0.0  0.0  0.0  1.0  0.0  0.0  0.0  2.2  0.0 14.6       17.8
>  7            0.0  0.0  0.0  0.0  3.6  0.2  0.0  2.0  0.0  0.2        6.0
>  8            0.0  0.0 10.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0       10.0
>  9            0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0        0.0
>  10           1.0  1.4  0.0  0.0  0.0  1.0  0.4  0.0  0.0  0.0        3.8
>  11           0.0  8.2  0.0  0.0  0.0  0.0  8.4  0.0  0.0  0.4       17.0
>  12          10.8  0.8  0.0  0.0  0.0  0.0  1.0  0.0  0.0  4.2       16.8
>  13          32.8  0.0  0.0  0.8  0.0  0.0  0.0  0.0  0.2  0.2       34.0
>  14           1.0  0.0  1.6  0.2  0.0  0.0  0.0  0.0  0.0  0.0        2.8
>  15           0.0  0.0  0.0  2.2  1.4  0.0  0.0  0.0  0.0  0.0        3.6
>  16           0.6  0.0  0.0  0.6 22.0  0.0  0.0  0.0  0.0  0.0       23.2
>  17           0.0  0.0  0.0  0.0  0.0  0.0  2.8  0.0  0.0  0.0        2.8
>  18           2.8  0.0  0.0  0.0  0.0  0.0  8.2  0.0  0.0  8.2       19.2
>  19           0.0  0.0  0.0  0.0  0.0  0.2  0.0  0.0  0.0  0.2        0.4
>  20           0.0  8.2  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0        8.2
>  21           0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0        0.0
>  22           0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.4        0.4
>  23           0.0  0.0  0.0  0.0  0.0  0.0  0.0  1.2  0.0  0.0        1.2
>  24           0.0  0.0  0.0  0.0  1.0  0.0  0.0  2.0  8.2  0.0       11.2
>  25           3.2  0.0  0.0  0.6  0.6  0.0  0.0  0.0 11.8  0.0       16.2
>  26           0.0  0.0 26.2  0.0 12.6  0.0  0.0  2.2  0.0  0.0       41.0
>  27           0.2  0.0 10.6  0.0  1.2  0.0  0.0  1.8  0.0  0.0       13.8
>  28           0.0  4.0  0.0  5.8  0.0  0.0  0.0  0.0  0.0  0.0        9.8
>  29           0.2 12.4  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0       12.6
>  30           0.0  2.6  0.0  0.0  2.2  0.0  0.0  0.0  0.0  0.0        4.8
>  31           0.0  0.0  0.6  0.0  0.8  0.0  0.0  0.0  4.8  0.0        6.2
>  Year Totals 62.8 40.2 51.2 29.8 70.0 12.8 30.8 57.2 55.2 47.6      457.6
>
>
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-- 
彭河森 Hesen Peng
Department of Statistics, Fudan University, Shanghai, P. R. C.
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