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並前往https://cran.r-project.org/web/packages/RcppArmadillo/vignettes/RcppArmadillo-sparseMatrix.pdf

RcppArmadillo: Sparse Matrix Support

R Code. R> i <- c(1,3:8). R> j <- c(2,9,6:10). R> x <- 7 * (1:7). R> A <- sparseMatrix(i, j, x = x). R> sqrt_(A). 8 x 10 sparse Matrix of class "dgCMatrix".

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