Hi all,
I have a dataframe of the following type:
Day Place dendrometer max
1 1 1 4684
2 1 1 4831
..
1 1 2 2486
2 1 2 2596
.
1 2 1 6987
2 2 1 6824
I need the first element of each dendrometer as NA, so every time R
calculates "max" for a new dendrometer (independently of the place), starts
with NA, like this:
Day Place dendrometer max
1 1 1 NA
2 1 1 4831
..
1 1 2 NA
2 1 2 2596
.
1 2 1 NA
2 2 1 6824
Could you also let me know I could calculate MEAN of the max column for each
dendrometer within each ring (sapply, aggregate?) instead of calculating
mean for the entire max column?
Thanks!
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