Is this a bug with a simple arithmetic operation with a vector object?
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) Why? Everitt's book is extremely badly typeset, and `< -' is in fact `<-' not `<- -' as you have entered. But the laws of arithmetic say R was right.
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".
Why `mind you'? A phrase involving `workmen' and `tools' springs to mind.
Clues, anyone?
Find a more reliable (and less outdated) guide ....
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._