[Rd] Rscript and default packages

[Simon Urbanek]

On Sep 4, 2009, at 10:20 , Simon Urbanek wrote:

>
> On Sep 3, 2009, at 13:52 , Romain Francois wrote:
>
>> On 09/03/2009 05:23 PM, Duncan Murdoch wrote:
>>>
>>> On 03/09/2009 9:53 AM, Romain Francois wrote:
>>>> Hi,
>>>>
>>>> Is is possible to embed inside an R script, the name of the default
>>>> packages to be loaded when the script is invoked with Rscript.
>>>>
>>>> I know about the --default-packages argument, but I was wondering  
>>>> if
>>>> there was a mechanism to embed this information within the script  
>>>> itself
>>>
>>> I don't understand what you'd want here that you don't get with  
>>> attach()
>>> or require(). Why does it matter if they are default?
>>>
>>> Duncan Murdoch
>>
>> Sorry for being vague. I am more interested in not loading some  
>> packages:
>>
>> $ time Rscript  -e "#"
>>
>> real	0m0.224s
>> user	0m0.188s
>> sys	0m0.032s
>>
>>
>> $ time Rscript --default-packages="base" -e "#"
>>
>> real	0m0.067s
>> user	0m0.033s
>> sys	0m0.016s
>>
>>
>> $ time r -e "#"
>>
>> real	0m0.039s
>> user	0m0.032s
>> sys	0m0.006s
>>
>> This is related to the "How to ship R scripts with R packages"  
>> thread. I'd like for example to ship a script that I know only  
>> requires the "base" package. How would I specify this from within  
>> the script.
>>
>
> Well, what's wrong with:
>
> #!/usr/bin/Rscript --default-packages=base
>
> ginaz:sandbox$ time ./scr
>
> real	0m0.045s
> user	0m0.027s
> sys	0m0.017s
>
> .. as opposed to
>
> #!/usr/bin/Rscript --default-packages=base
>

oops, this one was actually just

#!/usr/bin/Rscript


> ginaz:sandbox$ time ./scr
>
> real	0m0.201s
> user	0m0.166s
> sys	0m0.034s
>
> Cheers,
> Simon
>
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