index-class {Matrix} | R Documentation

## Virtual Class "index" - Simple Class for Matrix Indices

### Description

The class `"index"` is a virtual class used for indices (in signatures) for matrix indexing and sub-assignment of Matrix matrices.

In fact, it is currently implemented as a simple class union (`setClassUnion`) of `"numeric"`, `"logical"` and `"character"`.

### Objects from the Class

Since it is a virtual Class, no objects may be created from it.

### See Also

`[-methods`, and `Subassign-methods`, also for examples.

### Examples

    showClass("index")

[Package Matrix version 1.2-17 Index]