[R] Saving iterative components

[Liviu Andronic]

On Tue, Dec 14, 2010 at 10:34 AM, Annalaura <annalaura.russo at imaa.cnr.it> wrote:
>
> Thanks a lot Uwe Ligges, I've abandoned R for a few time but now I'm working
> with it, so I've a question about the last problem that you solved: instead
> to write
> cv_1994<- idw.cv("X01_1994")
> cv_1995<- idw.cv("X01_1995")
> cv_1996<- idw.cv("X01_1996")
> cv_1997<- idw.cv("X01_1997")
> .....
> cv_2006<- idw.cv("X01_2006")
> cv_2007<- idw.cv("X01_2007")
> cv_2008<- idw.cv("X01_2008")
> can I use a more compact expression????
>
Yes. There are nicer ways to formulate the problem (and the solution),
but without access to the object all I can is a shot in the dark.
##obtain a vector of variable names
vars <- names(Tmese[, -(1:2)])
##apply the function 'idw.cv' iteratively, each time
##using a 'vars' element as the functions first argument;
##store the results in a list
res <- lapply(vars, idw.cv)
res

Regards
Liviu

PS For more on loops and the apply family check [1].
[1] http://promberger.info/files/rnews-vectorvsloops2008.pdf


> Thanks
>
>
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