[R] A statement over multiple lines (i.e. the ... feature in Matlab)

[Robin Hankin]

On 5 Oct 2006, at 09:34, Bjørn-Helge Mevik wrote:

> Robin Hankin wrote:
>
>> For the line breaking, R deals with incomplete lines by not
>> executing the statement until you finish it.
>
> Beware, however, that syntactically valid lines do get executed
> immediately (at least at the prompt).


yes, you're quite right.  Your observation
leads to my number 1 gotcha:

if(1<2)  print("1<2")
else
print("1>2")

which (properly) returns an error because the first line is  
syntactically
complete, so the "else" statement is processed ab initio.

So now I always always always always type


if(1<2){
   print("1<2")
} else {
   print("1>2")
}


if by some chance I ignore emacs/ESS's indentation telling me I've  
forgotten
a brace.


best wishes


rksh




> So
>
> 1 + 2
> - 3
>
> will be interpreted as two commands (returning 3 and -3,
> respectively), while
>
> 1 + 2 -
> 3
>
> will be interpreted as a single command (returnig 0).
>
> -- 
> Bjørn-Helge Mevik
>
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--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743