Error In . C Symbol Name Not In Load Table
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load table up vote 0 down vote favorite I have to call a function written in c++ from R in ubuntu. There are multiple .cpp files say file1.cpp , file2.cpp , file3.cpp, file4.cpp. The function to be called(named as function_name) resides in file1.cpp.I used the command in ubuntu-- R CMD SHLIB file1.cpp file2.cpp file3.cpp file4.cpp and file1.so was successfully created with other .o files. Then in Rstudio,I did dyn.load("file1.so") and file was loaded.But when I call the function through- output<-.C("function_name",arg_1,arg_2) I get-- Error in .C("function_name", arg_1,arg_2, : C symbol name "function_name" not in load table How do i rectify this?Is there anything missing? c++ r share|improve this question edited Jul 26 '14 at 20:15 Benjamin 11.4k1692171 asked Jul 20 '14 at 18:06 user2976762 115 1 Ensure that you have compiled the function in either 32-bit or 64-bit matching you R installation, e.g supply arguments -m32 for 32-bit to gcc which is called by R. –Jens Munk Jul 20 '14 at 18:13 1 Fyi, .C is approaching deprecation, I believe. The convention nowadays is to use .Call or .External. See Dirk's answer here, and also Hadley's comment. –Rich Scriven Jul 20 '14 at 18:15 Is there anything related to both of them being .cpp files? because when i use the same procedure by having same files as .c files, everything is running as expected –user2976762 Jul 20 '14 at 18:23 1 Be sure and use extern "C" function_name() in your code otherwise the name will be mangled. –brian beuning Jul 20 '14 at 18:35 add a comment| act
I was, then you are probably trying to write an extension for R in C++ and not C. I was just writing a function "linsgp" in C++. See if the following scenario is familiar to you > dyn.load("main.so") > .C("linsgp") Error in .C("linsgp") : C symbol name "linsgp" not in load table My C++ http://stackoverflow.com/questions/24853377/r-c-symbol-not-in-load-table code looked like this ... void linsgp(){ ... What is missing is extern "C", so it should look like this: ... extern "C" void linsgp(){ ... The reason is that C++ supports overloading of function names and so the compiler mangles the name with information about the arguments. C, http://www.lindonslog.com/programming/error-in-c-c-symbol-name-not-in-load-table/ however, does not support this and doesn't mangle the name. Inserting extern "C" tells the compiler not to mangle the name such that the name used for linkage is C-compatible. Share this:FacebookTwitterGoogleLike this:Like Loading... Leave a Reply Cancel reply Categories Linux/Unix (16) Mathematics (22) Linear Algebra (5) Statistics (17) Programming (23) julia (1) OpenMP (6) R (12) scala (1) Recent Posts Separating Convergence Criterion from Iterative Algorithms in Scala Using Iterators MALA - Metropolis Adjusted Langevin Algorithm in Julia Passing Julia Type to C Function as Struct Send Lines of Code from Vim to R/Julia/Python REPL C++ Merge Sort Algorithm Generate Random Inverse Gaussian in R Generalized Double Pareto Priors for Regression EM Algorithm for Bayesian Lasso R Cpp Code Compile R and OpenBLAS from Source Guide Sponsors Copyright © 2016 Lindons Log - . | Winter WordPress Theme %d bloggers like this:
search in one of my http://comments.gmane.org/gmane.comp.lang.r.rcpp/5497 setsExclude this search from one of my sets 2 messages in org.r-project.r-help[R] error in Error in Calling C++ function fro...FromSent OnAttachmentsgsmatos1Nov 24, 2006 8:59 am Barry RowlingsonNov 24, 2006 9:58 am Subject:[R] Error in Calling C++ function from R!!!From:Barry Rowlingson (B.Ro...@lancaster.ac.uk)Date:Nov 24, 2006 9:58:22 error in . amList:org.r-project.r-help product<-.C("prodgdot",myx=x,muy=y,myn=NROW(x),myoutput=as.double(0)) Error in .C("prodgdot", myx = x, muy = y, myn = NROW(x), myoutput = as.double(0)) : C symbol name "prodgdot" not in load table Does anyone know what is the problem? C++ name mangling? http://cran.r-project.org/doc/manuals/R-exts.html#Interfacing-C_002b_002b-code Solution: wrap in extern "C" { ... } as discussed there. Barry Tue 09:07:20 | cache-1.a | 0.03 seconds | © 2007-2014 MarkLogic Corporation. All rights reserved. Home | Browse | FAQ | Advertising | Blog | Feedback | MarkMail™ Legalese | About MarkLogic Server