[Rd] Rscript and default packages

[Romain Francois]

On 09/04/2009 04:20 PM, 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:

Great. Just a bit of work to generate the shebang line at INSTALL time 
(Rscript is at /usr/local/bin on my machine).

... or perhaps I could use #!/bin/env

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


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Romain Francois
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