等效于Matrix类的rowum函数(dgCMatrix) [英] Equivalent of rowsum function for Matrix-class (dgCMatrix)

问题描述

对于基R矩阵类，我们具有rowsum函数，该函数对于计算行组之间的列总和非常快.

For the base R matrix class we have the rowsum function, which is very fast for computing column sums across groups of rows.

在Matrix-package中是否实现了等效的功能或方法?

Is there an equivalent function or approach implemented in the Matrix-package?

对于大型dgCMatrix对象(即数百万行，但稀疏度约为95％)的快速替代品rowsum，我尤其感兴趣.

I'm particularly interested in a fast alternative to rowsum for large dgCMatrix-objects (i.e. millions of rows, but roughly 95% sparse).

推荐答案

我知道这是一个老问题，但是Matrix :: rowSums可能就是您要寻找的函数.

I know this is an old question, but Matrix::rowSums might be the function you are looking for.

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