[R] seq in R

[Peter Dalgaard]

Omar Lakkis <uofiowa at gmail.com> writes:

> I want to generate a sequence from 1 to x by 1
> seq(1,x,by=1)
> I want the above to return an empty list if x is zero
> In other languages I can do 1:x:1 to force the increment by to be a
> positive 1. This syntax does not work in R. In R 1:x gives me
> 1 0
> when x is zero, this is not what I want.
> The seq statement above throws an error when x is 0. 
> How can I generate a sequence where if the "to" value is less than the
> "from" value an empty list is generated with no errors?

Provide a length argument. In your case, seq(length=x) should suffice. 

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