> should I rewrite my C code using Call in R? Yes, rewrite it to use the .Call() interface.
Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-devel-boun...@r-project.org [mailto:r-devel-boun...@r-project.org] On > Behalf > Of Tee-Jay-Ardie > Sent: Wednesday, June 19, 2013 7:15 AM > To: r-devel@r-project.org > Subject: [Rd] Calling an array in a struct in C to R > > Hi there, > > Although I'm a quite experienced R user and know my ways in C, I stumbled > upon a problem I don't know how to solve. Therefore, I hope someone can > provide me with the information or pointers I need in order to understand > the way in which the communication between R and C occurs. I have the > following C code which basicallly reflects what I want: > > typedef struct > { > float *array; > size_t used; > size_t size; > } Array; > > void main2R() > { > Array a; > examplefunction(&a); /*fills and dynamically grows a->array*/ > } > > Now I would want to return a.array or a->array to R. According to the R > manuals, the compiled C code should not return anything except through its > arguments. The problem here is, I have a dynamically growing array, and I > have no idea what to pass on to C from R in order to let that work. > The word 'should' indicates that the compiled code may return something in > special circumstances, but I have no idea how to get a.array in R. > > So my question is simply this: How on earth do I get the information in the > float array 'a.array' in R? Is it even possible or should I rewrite my C > code using Call in R? > > Another, not preferred, options is to pre-allocate the array/vector in R on > a fixed (large-enough) size? Or do I miss something here? > > Regards. > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Calling-an-array-in-a- > struct-in-C-to-R-tp4669884.html > Sent from the R devel mailing list archive at Nabble.com. > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
