hope this helps.. :)
# define an object `x`
x <- list( "any value here" , 10 )
# set `myoption` to that object
options( "myoption" = x )
# retrieve it later (perhaps within a function elsewhere in the package)
( y <- getOption( myoption ) )
it's nice to name your options `mypackage.myoption` so users know what
package the option is associated with in case they type `options()`
here's the `.onLoad` function in the R survey package. notice how the
options are only set *if* they don't already exist--
> survey:::.onLoad
function (...)
{
if (is.null(getOption("survey.lonely.psu")))
options(survey.lonely.psu = "fail")
if (is.null(getOption("survey.ultimate.cluster")))
options(survey.ultimate.cluster = FALSE)
if (is.null(getOption("survey.want.obsolete")))
options(survey.want.obsolete = FALSE)
if (is.null(getOption("survey.adjust.domain.lonely")))
options(survey.adjust.domain.lonely = FALSE)
if (is.null(getOption("survey.drop.replicates")))
options(survey.drop.replicates = TRUE)
if (is.null(getOption("survey.multicore")))
options(survey.multicore = FALSE)
if (is.null(getOption("survey.replicates.mse")))
options(survey.replicates.mse = FALSE)
}
<environment: namespace:survey>
On Sat, Jun 1, 2013 at 4:01 PM, Jonathan Greenberg <j...@illinois.edu>wrote:
> R-helpers:
>
> Say I'm developing a package that has a set of user-definable options that
> I would like to be persistent across R-invocations (they are saved
> someplace). Of course, I can create a little text file to be written/read,
> but I was wondering if there is an "officially sanctioned" way to do this?
> I see there is an options() and getOptions() function, but I'm unclear how
> I would use this in my own package to create/save new options for my
> particular package. Cheers!
>
> --j
>
> --
> Jonathan A. Greenberg, PhD
> Assistant Professor
> Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
> Department of Geography and Geographic Information Science
> University of Illinois at Urbana-Champaign
> 607 South Mathews Avenue, MC 150
> Urbana, IL 61801
> Phone: 217-300-1924
> http://www.geog.illinois.edu/~jgrn/
> AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007
>
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>
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