On 15 March 2018 at 16:29, Pavankumar Gurazada wrote: | As a part of utilizing network data drawn at random before further | processing, I am trying to call a couple of functions from the igraph package | at the beginning of each iteration. The code I use is as follows:
This is a cross-posted (which we discourage) over at StackOverflow at where I saw it first and already answered it: https://stackoverflow.com/questions/49299368/calling-igraph-from-within-rcpp In short, needs these two lines (or equivalent) in the middle: SEXP g = game_er(Named("n", n), Named("p", p)); S4 A_m = get_adjacency(Named("g", g)); Dirk | #define ARMA_64BIT_WORD#include <RcppArmadillo.h> | // [[Rcpp::depends(RcppArmadillo)]]// [[Rcpp::plugins(cpp11)]] | using namespace Rcpp; | | using arma::sp_mat; | // [[Rcpp::export]] | sp_mat adj_mat(int n, double p) { | | Environment igraph("package:igraph"); | Function game_er = igraph["erdos.renyi.game"]; | Function get_adjacency = igraph["get.adjacency"]; | | List g = game_er(Named("n", n), Named("p", p)); | | NumericMatrix A_m = get_adjacency(Named("g", g)); | | sp_mat A = as<sp_mat>(A_m); | | return A;} | | | /*** R | set.seed(20130810) | library(igraph) | | adj_mat(100, 0.5)*/ | | | | So, while the C++ compiles without warnings, the following error is thrown: | | > sourceCpp("Hooking-R-in-cpp.cpp") | > set.seed(20130810) | > library(igraph) | > adj_mat(100, 0.5) | Error in adj_mat(100, 0.5) : | Not compatible with requested type: [type=S4; target=double]. | | >From the error it looks like I am passing a S4 class to a double? Where is | the error? | _______________________________________________ | Rcpp-devel mailing list | Rcpp-devel@lists.r-forge.r-project.org | https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel -- http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
