Multiplication (PR#8466)
Thanks
Herve Pages wrote:
Thomas Lumley wrote:
On Fri, 6 Jan 2006, casella at stat.ufl.edu wrote:
hi - in version 2.1 the command
-2^2
gives -4 as the answer. (-2)^2 is evaluated correctly.
So is -2^2. The precedence of ^ is higher than that of unary minus.
It may be surprising, but it *is* documented and has been in S for a
long time.
-thomas
No, it's not surprising. At least to me... In the country where I grew up, I've been teached that -x^2 means -(x^2) not (-x)^2 ;-) H.
George Casella Phone: (352) 392-1941 Ext. 204 Distinguished Professor and Chair Cell: (352) 682-7210 Department of Statistics Fax: (352) 392-5175 University of Florida Email: casella at stat.ufl.edu P.O. Box 118545 Gainesville, FL 32611-8545