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從RCCP開始不堪重負。我如何能夠像代碼中定義的那樣,使用(索引,讀取和賦值)稀疏矩陣,就像我能用'標準'矩陣一樣?在C++中使用稀疏矩陣的Rcpp
library('Matrix')
library(Rcpp)
library(inline)
r <- matrix(seq(1,9,1),ncol=3,nrow=3)
i <- Matrix(0, nrow = nrow(r) * ncol(r), ncol = nrow(r)*ncol(r), sparse=TRUE)
fx <- cxxfunction(signature(x_ = "matrix" ,y_="dsCMatrix"), '
NumericMatrix x(x_) ;
int nr = x.nrow(), nc = x.ncol() ;
for (int i = 0; i < nr; i++) {
for (int j = 1; j < nc; j++) {
x(i,j) = 1;
}
}
return wrap(x) ;
', plugin = "Rcpp")
fx(r,i)