[R] numeric(0)

Gabor Grothendieck ggrothendieck at myway.com
Wed Dec 29 18:32:12 CET 2004

From:   <Ted.Harding at nessie.mcc.ac.uk>

> What's the best place to look for the details on operator
> precedence and the like in R?

Check out the language reference manual in the directory
   .../R/rw2001/doc/manual/r-lang.pdf .

On Windows its also accessible from R via 
   Help | Manuals | R Language

The manuals can also be found online.  e.g. Google for 
   r-lang "infix and prefix"
to find the relevant section.

By the way, even without this problem seq is better than : in 
programs as it has better boundary behavior.  Consider 1:n vs.
seq(length = n).  For n=0 the : operator actually generates the
vector c(1,0) whereas the seq solution gives a zero length
vector, as desired.  Even seq has problems unless you use
length= .

The : operator is mainly useful if you are typing throwaway 
code directly into R.

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