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marat
2007 Jan 20
4
Question about converting from square roots to decimals and back
Hi,
I apologize if there is a simple answer to this question that I've
missed. I did search the mailing list but I might not have used the
right keywords. Why does sum(A3^2) give the result of 1, but
sum(A3^2)==1 give the result of FALSE?
> A3<-matrix(nrow=3,c(1/(2^.5),1/(2^.5),0))
> A3
[,1]
[1,] 0.7071068
[2,] 0.7071068
[3,] 0.0000000
> sum(A3^2)
[1] 1
>