R devel - Apr 2009 - R in standalone application

I am trying to build a C application where I need to compute some 
statistics to take decisions about the direction to give to a user, 
knowing his/her habits. Because I used R back at school, I thought I can 
use some of his functions in my application,  as a shared library. I 
reviewed the "Rinternals" and "R extensions"  documents, and
decided to
give a try to the REmbedded.c file. Compilation and linking went well. 
But the execution failed with a "Fatal error: R home directory is not 
defined". Does it mean that R has to to be distributed with my 
application or, did I miss something in my readings ? If that is of any 
importance, I am working on unix but aim for full portability (i.e 
Windows too)

Thanks for any assistance.

Eric,

On Mar 31, 2009, at 10:50 PM, Eric wrote:
> I am trying to build a C application where I need to compute some  
> statistics to take decisions about the direction to give to a user,  
> knowing his/her habits. Because I used R back at school, I thought I  
> can use some of his functions in my application,  as a shared  
> library. I reviewed the "Rinternals" and "R extensions"
documents,
> and decided to give a try to the REmbedded.c file. Compilation and  
> linking went well. But the execution failed with a "Fatal error: R  
> home directory is not defined". Does it mean that R has to to be  
> distributed with my application or, did I miss something in my  
> readings ?
Yes - you didn't read the 8.1 section of R-ext attentively enough. It  
tells you that you need to setup the environment properly and the  
easiest way to do that on unix is to run
R CMD yourApp

Clearly, R must be installed in order to use your application, since  
your application is using R ;). It is common for the embedding  
application to determine the correct settings before starting R (see  
the R.app GUI on how to setup the environment on a Mac in a GUI  
application [you can still use R CMD though], see for example Rserve  
on how to find the R settings from the registry on Windows).

Cheers,
Simon

> If that is of any importance, I am working on unix but aim for full  
> portability (i.e Windows too)
>
> Thanks for any assistance.
>
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