From murdoch.duncan at gmail.com  Wed Aug  3 23:19:58 2016
From: murdoch.duncan at gmail.com (Duncan Murdoch)
Date: Wed, 3 Aug 2016 17:19:58 -0400
Subject: [Rd] seq.int does not return a sequence of integers sometimes
In-Reply-To: <CAErODj_hSunpyZug+dbH7rLuBJuUtsnNvjK_4ii=Pwct6W-1mg@mail.gmail.com>
References: <CAErODj_hSunpyZug+dbH7rLuBJuUtsnNvjK_4ii=Pwct6W-1mg@mail.gmail.com>
Message-ID: <79576c75-b370-b00c-5a93-7a8703338f70@gmail.com>

On 03/08/2016 4:12 PM, Paul Johnson wrote:
> I have a script that goes wrong because I assumed that seq.int would
> return integers.

"int" means "internal", not "integer".  Sometimes you should read the 
documentation.

Duncan Murdoch

>
> 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.
>



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