TO_scipy_sparse: conversion of an R sparse matrix to a scipy sparse matrix

In mlampros/RGF: Regularized Greedy Forest

Description

conversion of an R sparse matrix to a scipy sparse matrix

Usage

TO_scipy_sparse(R_sparse_matrix)

Arguments

R_sparse_matrix

an R sparse matrix. Acceptable input objects are either a dgCMatrix or a dgRMatrix.

Details

This function allows the user to convert either an R dgCMatrix or a dgRMatrix to a scipy sparse matrix (scipy.sparse.csc_matrix or scipy.sparse.csr_matrix). This is useful because the RGF package accepts besides an R dense matrix also python sparse matrices as input.

The dgCMatrix class is a class of sparse numeric matrices in the compressed, sparse, column-oriented format. The dgRMatrix class is a class of sparse numeric matrices in the compressed, sparse, row-oriented format.

References

https://stat.ethz.ch/R-manual/R-devel/library/Matrix/html/dgCMatrix-class.html, https://stat.ethz.ch/R-manual/R-devel/library/Matrix/html/dgRMatrix-class.html, https://docs.scipy.org/doc/scipy/reference/generated/scipy.sparse.csc_matrix.html#scipy.sparse.csc_matrix

Examples

try({
    if (reticulate::py_available() && reticulate::py_module_available("scipy")) {

        if (Sys.info()["sysname"] != 'Darwin') {

            library(RGF)


            # 'dgCMatrix' sparse matrix
            #--------------------------

            data = c(1, 0, 2, 0, 0, 3, 4, 5, 6)

            dgcM = Matrix::Matrix(
                data = data
                , nrow = 3
                , ncol = 3
                , byrow = TRUE
                , sparse = TRUE
            )

            print(dim(dgcM))

            res = TO_scipy_sparse(dgcM)

            print(res$shape)


            # 'dgRMatrix' sparse matrix
            #--------------------------

            dgrM = as(dgcM, "RsparseMatrix")

            print(dim(dgrM))

            res_dgr = TO_scipy_sparse(dgrM)

            print(res_dgr$shape)
        }
    }
}, silent=TRUE)

mlampros/RGF documentation built on March 17, 2021, 1:50 p.m.