Re: [Rd] modifying some package code

From: Simon Urbanek <simon.urbanek_at_r-project.org>
Date: Thu, 24 May 2012 12:58:15 -0400

On May 24, 2012, at 12:25 PM, Charles Determan Jr wrote:

> Greetings,
>
> I am working on modifying some code from the nlme package. I have had many
> discussions on the mixed models mailing list and have been directed to
> simply 'hack' the source code to have the degrees of freedom generated by
> one function to use in the output of another function that doesn't generate
> them. My current holdup is an error regarding a .c file called
> 'inner_perc_table' called by the .C function. The error states that the
> object 'inner_perc_table' is not found. My confusion lies in the fact that
> when I run the original script, it recognizes the part just fine. At no
> point is the object defined and I cannot currently find such a code in the
> package's source. Perhaps someone here is familiar with the nlme package
> and could assist me in some form. If you need further information, please
> ask as I don't know if there is a general answer for this type of question
> or if you will need the actual code.
>

The (unexported) object contains cached reference to the native function (see ?getNativeSymbolInfo) and is defined by R_registerRoutines in src/init.c. This is a typical optimization in R packages to avoid costly lookup of symbols and to provide check for native arguments.

Cheers,
Simon



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