Hello, R-helpers.
I have a data frame below called df. I want to add a variable c, based on
the following logic:
if df$a < 5 then the first two times this condition is met place a 1 in c,
the next two times this condition is met place a 2 in c and when the
condition is not met let c equal df$b. The result would look like, dfnew,
shown below.
a <- rep(c(3,5,7), 4)
b <- rep(c(NA,1,2), 4)
df <- data.frame(a,b)
> df
a b
1 3 NA
2 5 1
3 7 2
4 3 NA
5 5 1
6 7 2
7 3 NA
8 5 1
9 7 2
10 3 NA
11 5 1
12 7 2
c <- c(1 , 1, 2, 1, 1, 2, 2, 1, 2, 2, 1, 2)
dfnew <- data.frame(a, b,c)
> dfnew
a b c
1 3 NA 1
2 5 1 1
3 7 2 2
4 3 NA 1
5 5 1 1
6 7 2 2
7 3 NA 2
8 5 1 1
9 7 2 2
10 3 NA 2
11 5 1 1
12 7 2 2
Thanks
Greg
R 2.7 XP
--
Gregory L. Blevins
Office 952 944-5743
Cell 612 251 0232
[EMAIL PROTECTED]
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