I'm choosing observations to be included in a subset of a larger data set
R code:
var1 <- c(1,0,0,3,1)
var2 <- c(0,0,0,0,0)
var3 <- c(1,1,0,0,0)
df <- cbind(var1, var2, var3)
How could I select the subset of the data that contains only observations having one "1" in any given column (in this case I should end up selecting rows 2 and 5)?