Dear R-helpers Are there any established R packages that include a C code generator -- that generates new C language files and compiles them?
To be precise what I'm looking for is a process that takes text input in some format (it might be pseudocode, fragments of C code, etc) and creates a valid C language source file that can be compiled by R CMD COMPILE. Ideally the procedure should also cause the C code to be compiled and dynamically loaded. To give a trivial example, suppose I want to be able to perform image filtering operations on matrices. All filters have the same structure: each position [i,j] in the matrix is visited in a double loop; a calculation (depending on the filter) is performed using the value at [i,j] and also the values at neighbouring positions [i+1,j] , [i+1,j+1] etc; the result is written to the output matrix at the position [i,j]. The C code for the loop is always the same; only a few lines of code that perform the filter calculation will change. I would like a procedure that accepts a text file containing just a few lines of C code or pseudocode, and inserts these lines into the appropriate place in the loop, producing a valid C language routine which can then be compiled by R CMD COMPILE and dynamically loaded. (Of course, it can get more complicated than just inserting a single text fragment!) I once implemented such a feature in an image processing package, so I know it's not hard. Before dusting off this ancient code I would like to learn whether there's an R package or other open source program that already does it. Any pointers would be welcome thanks Adrian Baddeley ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
