[R] R in batch mode packages loading question

[PALMIER Patrick (Responsable de groupe) - CETE NP/TM/ST]

Thank you for your response, but this is not exactly what I need

We are working on a tool that automatically generate R scripts adapted
to our surveys databases.
When we want to do a table, we select interactively fields, associated
labels, functions for an automatic crosstable for example
Then, the tool executes R in batch mode with the script produced by the tool
The "many scripts" correspond to the many crosstables people want to do.
It is not possible produce these different scripts and execute all of
them in a unique script with source.

For example, people want to do a crosstable, the tool produce a r script
that generate the result. Then, the user want to do the same crosstable
but on a subset or with different labels. Then, the tools produces
another r script, and execute R which reloads at each time all the
neeeded packages.

Is there a way to avoid this thing and to load packages only once?


Than you in advance

*Patrick PALMIER**
***


Le 07/11/2011 15:20, > Duncan Murdoch (par Internet) a écrit :
> On 07/11/2011 5:49 AM, PALMIER Patrick (Responsable de groupe) - CETE 
> NP/TM/ST wrote:
>> Hello,
>>
>>
>> I use R in batch mode. Each time, I execute a script, R is loading each
>> packages I need in my script. That's Ok
>> But, I had to execute many scripts , and each time R is re-loading the
>> corresponding packages, which take to much time
>>
>> Is it possible ask R to load the packages only once, and stay in memory
>> in background for further scripts, which would avoid to load the
>> packages in each script, or if you have another solution that need to
>> only load packages once in the first scripts, so that further scripts do
>> not need to load these packages too.
>
> Write one script that has a sequence of calls to source() to run the 
> other scripts.
>
> You'll need to be careful that unintentional leftover objects and 
> settings from one script don't affect the others; you may also want to 
> use the "echo=TRUE" option when you source, so you see the commands as 
> they are executed.
>
> Duncan Murdoch
>
>