The sd function is doing *exactly* what it should.

the sd of 5 is "NA", and the sd of 7 is "NA"

try looking at "a" itself. My guess is that you didn't intend to have
two columns each with one value.

Did you instead intend to have 5 and 7 in one vector, like so:

a<-c(5,7)
sd(a)

Glen

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