[R] Is this a bug with a simple arithmetic operation with a vector object?

[hzi]

Hello-

    While I was reading a tutorial book for R (actually, for S-Plus:Brian S. Everitt. A Handbook of Statistical Analysis using S-PLUS. Chapman & Hall, London, 1994) I tried to execute this simple exercise:

        > x <- -c(1,2,3,4,5,6)
    > X <- -c(10,11,12,100,-5,-6)
    >x+X
    [1] -11, -13, -15, -104, 0, 0

    As you can see, the added vectors resulted in negative numbers ! (the answer should have been: [1] 11, 13, 15, 104, 0, 0)
    Mind you, this is R 1.2.1 for Windows, under WIndows ME, 64 Mb RAM, pIII 800 MHz. The same thing happens, however, with the recently distributed "R 1.2.2 patched".
    Clues, anyone?

    Thank you.
    Best regards,
      
    Henry
    hzi at uol.com.br
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