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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
       preconditioners, 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; }
       };



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