[R] seq curiosity

[Uwe Ligges]

John Aitchison wrote:
> 
> Is this a bug or a feature?
> 
> > seq(0:4)  # colon
> [1] 1 2 3 4 5
> > 0:4
> [1] 0 1 2 3 4
> > seq(0,4)
> [1] 0 1 2 3 4
> 
> I am aware that the first usage is incorrect, but I was surprised that
> I did not get any sort of syntax error

It's a feature! It's mentioned in the help page. If you provide a vector
(length > 1) as an argument to seq(), seq() is smart enough to detect
the case "seq(along)":

 along <- 0:4
 seq(along)

The same should happen for

 along <- LETTERS[10:14]
 along
 seq(along)

Everything works perfectly!

Uwe
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