Good Evening
Is there a setting that I can change in R so that I get either a warning or an
error message if I reference non-existent data in a data frame? For example I
get no warning or error message with the following:
> set.seed(2013)
> df0=data.frame(cbind(x=rnorm(1000),y=rnorm(1000)))
> df0$z=df0$w
> head(df0)
x y
1 -0.09202453 1.51179695
2 0.78901912 -0.60084547
3 -0.66744232 -0.02180077
4 1.36061149 -0.74909011
5 1.50768816 -2.25128946
6 -2.60754997 0.43708800
Thanks
Joe
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