## SUBSINDEX Overloaded Class Indexing

Section: Object Oriented Programming

### Usage

This method is called for classes in the expressions of the formc = subsindex(a)

where `a`

is an object, and `c`

is an index vector.
It is also called for

c = b(a)

in which case `subsindex(a)`

must return a vector containing
integers between `0`

and `N-1`

where `N`

is the number
of elements in the vector `b`

.