R: The number of non-zero values of a submatrix

nnzero {Corbi} | R Documentation

## The number of non-zero values of a submatrix

### Description

Retuen the number of non-zero values of the specified submatrix of a given sparse matrix rapidly

### Usage

    nnzero(m, rows = 1:dim(m)[1], cols = 1:dim(m)[2])

### Arguments

`m` | The matrix
`rows` | The integer vector of row index(es) or logical vector indicated the selected rows
`cols` | The integer vector of column index(es) or logical vector indicated the selected cols

### Details

This function implements faster calculation algorithm for the `CsparseMatrix` and `RsparseMatrix` class in the package Matrix.

### Value

This function will return the number of non-zero values in the specified submatrix.

[Package Corbi version 0.6-1 Index]