R help - Jul 2008 - incrementing for loop by 2

Dear List-serv members:
How can I structure a for loop so that it will increment the counter by two
using R?  I am just looking for a simple example that shows where the
incrementing part should go.  Thanks!

Jennifer

--
Jennifer Hayes Clark
Assistant Professor
Department of Political Science
University of Houston
Houston, TX 77204-3011

	[[alternative HTML version deleted]]

on 07/24/2008 07:59 AM Clark, Jennifer H wrote:
> Dear List-serv members: How can I structure a for loop so that it
> will increment the counter by two using R?  I am just looking for a
> simple example that shows where the incrementing part should go.
> Thanks!
It would be helpful to have an idea of what you are trying to 
accomplish, as there may very well be a better way than using a 'for'
loop.

That being said:

 > for (i in seq(0, 10, 2)) print(i)
[1] 0
[1] 2
[1] 4
[1] 6
[1] 8
[1] 10


See ?seq

HTH,

Marc Schwartz

Clark, Jennifer H wrote:
> Dear List-serv members:
> How can I structure a for loop so that it will increment the counter by two
using R?  I am just looking for a simple example that shows where the
incrementing part should go.  Thanks!
>
>   
for (i in seq(<start>, <end>, by=2)) { ... }

vQ

you can define the 'seq' argument of for() accordingly, e.g.,

for(i in seq(0, 20, 2)) print(i)


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
      http://perswww.kuleuven.be/dimitris_rizopoulos/


Quoting "Clark, Jennifer H" <jclar2 at Central.UH.EDU>:
> Dear List-serv members:
> How can I structure a for loop so that it will increment the counter  
>  by two using R?  I am just looking for a simple example that shows   
> where the incrementing part should go.  Thanks!
>
> Jennifer
>
> --
> Jennifer Hayes Clark
> Assistant Professor
> Department of Political Science
> University of Houston
> Houston, TX 77204-3011
>
> 	[[alternative HTML version deleted]]
>
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