[R] How to adjust the start of a series to zero? (i.e. subtract the first value from the sequence)
Kristiina Hurme
kristiina.hurme at uconn.edu
Mon Jul 2 03:39:32 CEST 2012
Thanks everyone.
I tried them all, and got all to work except for the last one.
I tried
> sort2v4$adj_mean<-within(sort2v4, ave(mean, point, FUN=function(x)x-x[1]))
> head(sort2v4)
point time mean sd adj_mean.point adj_mean.time adj_mean.mean
adj_mean.sd
1 1 1 52.50100 1.5073927 1 1 52.50100
1.5073927
3 1 2 54.50182 0.8510329 1 2 54.50182
0.8510329
4 1 3 56.60174 1.5787222 1 3 56.60174
1.5787222
5 1 4 57.20000 1.2292726 1 4 57.20000
1.2292726
6 1 5 59.30000 2.2632327 1 5 59.30000
2.2632327
7 1 6 57.80089 1.4745218 1 6 57.80089
1.4745218
but am getting the columns in duplicate, rather than it performing the
function. Any advice?
Thanks again,
Kristiina
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