On Thu, 2007-11-01 at 10:34 +0200, sigalit mangut-leiba
wrote:> hello,
> I have a simple question:
> I want to compute the average of 6 variables,
> my data looks like this:
>
> t0 t1 t2 t3 t4 t5
> 1 32 34 36 40 38 40
> 2 35 37 38 36 33 39
> .
> .
> .
> I want the mean of t0-t5 for each row (observation).
> thank you,
> sigalit.
Dear Sigalit,
See ?rowMeans
E.g.:
> dat <- scan()
1: 32 34 36 40 38 40
7: 35 37 38 36 33 39
13:
Read 12 items> dat <- data.frame(matrix(dat, nrow = 2, byrow = TRUE))
> names(dat) <- paste("t", 0:5, sep = "")
> dat
t0 t1 t2 t3 t4 t5
1 32 34 36 40 38 40
2 35 37 38 36 33 39> rowMeans(dat)
[1] 36.66667 36.33333>
HTH
G
>
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>
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