[Rd] seq.int does not return a sequence of integers sometimes

Paul Johnson pauljohn32 at gmail.com
Wed Aug 3 22:12:42 CEST 2016


I have a script that goes wrong because I assumed that seq.int would
return integers.

Below please see it does not unless user is super cautious about
inserting "L" with inputs. I think seq.int should do coercion for me
before returning the sequence.

> xx <- seq.int(1,10)
> class(xx)
[1] "integer"
> is.integer(xx)
[1] TRUE
> xx <- seq.int(1,10, 2)
> class(xx)
[1] "numeric"
> is.integer(xx)
[1] FALSE
> xx <- seq.int(1,10, 2L)
> class(xx)
[1] "numeric"
> is.integer(xx)
[1] FALSE
> xx <- seq.int(1L, 10L, 2L)
> class(xx)
[1] "integer"
> is.integer(xx)
[1] TRUE


I think all of those should have same return value, if the function is
correctly named seq.int.

-- 
Paul E. Johnson   http://pj.freefaculty.org
Director, Center for Research Methods and Data Analysis http://crmda.ku.edu

I only use this account for email list memberships. To write directly,
address me at pauljohn at ku.edu.



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