OK, this is very elementary, but I need help. I have looked in Verzani,
past postings etc.
Problem: I need to subtract the "length" date between "h4" and "a3" #which
would be 4-1
I would rather not convert the two columns into four columns (with headings
being "a3","a4","c4","h4").
DF <- data.frame(length=c(1,2,3,4),
Tanks=c("a3","a4","c4","h4"))
???
Much appreciated, keith
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