R: Transform Repeated Matrix Indexes

ij2ijv_i {multbxxc} | R Documentation

## Transform Repeated Matrix Indexes

### Description

Transforms a couple of index vectors ir and jc (ij of a sparse matrix) with possibly repeated values into sparse indexes i,j and a vector of 1d indexes of non zero values. The response can be then used for repeated creation of sparse matrices with the same pattern by calling `iv2v()` ir and jc are supposed to be sorted in increasing order, column-wise (ic runs first)

### Usage

    ij2ijv_i(ir, jc)

### Arguments

`ir` | An integer vector, row indexes
`jc` | An integer vector, column indexes

### Value

A list with fields i, j and iv

[Package multbxxc version 1.0.1 Index]