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

[A. J. Rossini]

On Sun, 1 Apr 2001, hzi wrote:

> 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?

Of course.   "<-" is assignment, but "-c(1,2,3,4,5,6)" = "c(-1,-2,-3...".
Well, you get the drift.  You've added a negative sign where you don't
want one.

best,
-tony


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