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Rcppで行列処理
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| library(Rcpp) | |
| sourceCpp("timesTwo.cpp") | |
| x = matrix(1:9, nrow = 3, ncol= 3) | |
| timesTwo(x) |
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| #include <Rcpp.h> | |
| using namespace Rcpp; | |
| // [[Rcpp::export]] | |
| NumericMatrix timesTwo(NumericMatrix x) { | |
| NumericMatrix y(3,3); | |
| for(int i=0; i<3; i++){ | |
| for(int j=0; j<3; j++){ | |
| y(i,j) = 2*x(i,j); | |
| } | |
| } | |
| return y; | |
| } |
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