Hi, Please see the code below this message. 'a' is a vector, 'b' is a scalar. But their types are show the same ('numeric'). If I use 'class()', I will not be able to tell the type difference between a vector and a scalar. I am wondering if there is any other command that can tell the type difference between a vector and a scalar. Regards, Peng > a=c(1,2,3) > class(a) [1] "numeric" > b=2 > class(b) [1] "numeric"

On Thu, Aug 20, 2009 at 10:49 PM, Peng Yu <pengyu.ut@gmail.com> wrote: > Hi, > > Please see the code below this message. 'a' is a vector, 'b' is a > scalar. But their types are show the same ('numeric'). If I use > 'class()', I will not be able to tell the type difference between a > vector and a scalar. I am wondering if there is any other command that > can tell the type difference between a vector and a scalar. > > Regards, > Peng > > > a=c(1,2,3) > > class(a) > [1] "numeric" > > b=2 > > class(b) > [1] "numeric" > Both are vectors. "b" is simply a vector of length 1. See ?vector and ?length. Sean [[alternative HTML version deleted]]