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modifying some package code
4 messages · Charles Determan Jr, Simon Urbanek
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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On May 24, 2012, at 1:26 PM, Charles Determan Jr wrote:
Simon, Thank you for this valuable information. However, you must forgive some ignorance on my part. If R-registerRoutines defines the native function, how should I go about fixing this issue? Would I copy the init.c to the base package (where I have the new function)?
I'm not sure what *is* your issue. nlms:::inner_perc_table is defined (automatically), so it just works. If you are re-using just the .C part of nlme somewhere else that you dyn-load manually then you can simply use "inner_perc_table" instead. Cheers, Simon
On Thu, May 24, 2012 at 11:58 AM, Simon Urbanek <simon.urbanek at r-project.org> wrote: 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