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

hzi hzi at uol.com.br
Sun Apr 1 09:25:28 CEST 2001


    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)
    [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,
    hzi at uol.com.br
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