Dear researchers,
sorry I know it's no the right mailist but I have this problem.
mydf <- data.frame(id=c(1,2,3,4,5),value=c(2,3,-5,6,-4))
id value
1 1 2
2 2 3
3 3 -5
4 4 6
5 5 -4
I wish to select and change the value of negative number
mydf[mydf$value >= -4 & mydf$value <= -5, c(2)] <- 100
to have
id value
1 1 2
2 2 3
3 3 100
4 4 6
5 5 100
but the normal expression doesn't work because they are negative value
thanks in advance
Gianni
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