Hello,
I am getting a strange error while computing standard deviation. If
the do the following I get the answer NA NA. Any help??? Thank you so
much.

a<- cbind()
a<- cbind(a, 5)
a<- cbind(a, 7)
print(sd(a))

If I compute the mean it works fine though i.e., print(mean(a)) works
just fine.

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