Lauri Nikkinen wrote:
Hi R-users,
I'm quite new to R and trying to learn the basics. I have a following
problem concerning the convertion of array object into data frame. I have
made following data sets
tmp1 - rnorm(100)
tmp2 - gl(10,2,length=100)
tmp3 - as.data.frame(cbind(tmp1,tmp2))
tmp3.sum - tapply(tmp3$tmp1,tmp3$tmp2,sum)
tmp3.sum - as.data.frame(tapply(tmp1,tmp2,sum))
and I want the levels from tmp2 be shown as a column in the data.frame, not
as row name as it now does. To put it in another way, as a result, I want a
data frame with two columns: levels and the sums of those levels. Row names
can be, for example, numbers from 1 to 10.
aggregate(tmp3[1], tmp3[2], sum)
tmp2tmp1
1 1 8.41550650
2 2 3.65831086
3 3 -0.26296334
4 4 3.45368671
5 5 -4.64383794
6 6 0.25640949
7 7 0.02832348
8 8 -0.03811150
9 9 1.41724121
10 10 -1.06780900
?aggregate
-Lauri Nikkinen
Lahti, Finland
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