Thanks! I'll try to stick to that advice!
Maybe there is a better way... Here is what I want:

I want to save some default settings for a package.
The user can change these using a function similar to par().
I do not want to use options() here as it will be quite a lot of parameters.
I was thinking about an invisible object in the global environment and using <<- or assign() to change the settings...

What other roads are there to go?

TIA
--Mark


Am 07.04.2012 um 22:51 schrieb Henrik Bengtsson:

> On Sat, Apr 7, 2012 at 1:30 PM, Mark Heckmann <mark.heckmann@gmx.de> wrote:
>> Hello,
>> 
>> using the <<- assignment operator I do not understand why the following does not work.
>> 
>> l <<- list()
>> l
>> list()
>> l$arg1 <<- "test"
>> error in l$arg1 <<- "test" : Objekt 'l' not found
>> 
>> ?"<<-" says:  "The operators <<- and ->> cause a search to made through the environment for an existing definition of the variable being assigned. If such a variable is found (and its binding is not locked) then its value is redefined, otherwise assignment takes place in the global environment. "
>> 
>> Still I do noch understand why the above does not work. The object l is in the global environment. Can someone explain it to me?
> 
> Yes, the object 'l' is in the global environment, but 'l$arg1' is not,
> cf. exists("l$arg1") and exists("l").  Instead, this works:
> 
> l <<- list();
> l$args1 <- "test";
> 
> but much much much much much much much much much much much much much
> much much much much much much much much much much much much much much
> much much much much much much much much much much much better, do NOT
> use "<<-" (or assign()/get()) unless you fully understand what you're
> doing and have a very good reason for doing it, and that reason should
> be able pass the embarrassment-test on public R mailing lists.  Got
> the point?  Don't use it - there is another way to do what you want to
> achieve - you just have to ask/find out how.
> 
> /H
> 
>> 
>> Thanks
>> --Mark
>> 末末末末末末末末末末末末末末末末末末
>> Mark Heckmann
>> Blog: www.markheckmann.de
>> R-Blog: http://ryouready.wordpress.com
>> 
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.

末末末末末末末末末末末末末末末末末末
Mark Heckmann
Blog: www.markheckmann.de
R-Blog: http://ryouready.wordpress.com











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