[R] Calculating column differences

[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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