debian man page for eye

eye(2rheolef)							    rheolef-6.1 						     eye(2rheolef)

NAME
       eye - the identity matrix

DESCRIPTION
       Following  matlab,  the name eye() is used in place of I to denote identity matrices because I is often used as a subscript or as sqrt(-1).
       The dimensions of eye() are determined by context.  The preconditioner interface is usefull when calling algorithms without  any  precondi-
       tioners, e.g.

	   int status = pcg (a, x, b, eye(), 100, 1e-7);

IMPLEMENTATION
       class eye {
       public:
	 eye() {}
	 template<class T> const vec<T>& operator* (const vec<T>& x) const { return x; }
	 template<class T> const vec<T>& solve (const vec<T>& x) const { return x; }
	 template<class T> const vec<T>& trans_solve (const vec<T>& x) const { x; }
       };

rheolef-6.1							    rheolef-6.1 						     eye(2rheolef)