Hello,
Inline.
Em 20-12-2012 15:47, Yanyuan Zhu escreveu:
Hello all, i'm a newbie to R and now I get stuck by the question, would
anybody help me please?
Suppose, I got the following
test <- data.frame(test1=c(c(0.00, 0.005, 0.01, 0.015, 0.02)))
test
test1
1 0.000
2 0.005
3 0.010
4 0.015
5 0.020
Now I want another column inside test, named test2
for i=c(1:5), If test$test1[i] is 0, then the value of test$test2[i] is
1/test1[i]
Note that this gives 1/0 == Inf.
Anyway, a possibility is
test$test2 <- 39
test$test2[test$test1 == 0] <- 1/test$test1[test$test1 == 0]
test
Hope this helps,
Rui Barradas
or else If test$test1[i] is not 0, then the value of test$test2[i] is 39
how should i programme in R to make it happen?
thanks a lot!
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