Dear Jeff,
read diff's help page, and you'll find out
what is wrong with your expectation.
What do think diff(df$Score) should give for
the first element in df$Score??
Hth -- Gerrit
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Dr. Gerrit Eichner Mathematical Institute, Room 212
gerrit.eich...@math.uni-giessen.de Justus-Liebig-University Giessen
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Am 24.03.2021 um 17:48 schrieb Jeff Reichman:
r-help forum
I'm trying to calculate the diff between two rows and them mutate the
difference into a new column. I'm using the diff function but not giving me
what I want.
df <- data.frame(ID=1:5,Score=4*2:6)
What a want where
ID Score diff
1 1 8 8
2 2 12 4
3 3 16 4
4 4 20 4
5 5 24 4
What I am getting
ID Score diff
1 1 8 NA
2 2 12 4
3 3 16 4
4 4 20 4
5 5 24 4
Jeff
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