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// Jacobian.hh -- data structures for the Jacobian matrix
// $Id$
//
// prerequisites:
//
//
// A Jacobian object stores the (a) Jacobian matrix of H with respect to h.
// Jacobian is an abstract base class, from which we derive a separate
// concrete class for each type of (storage scheme for the) Jacobian matrix.
//
// A row/column index of the Jacobian (denoted II/JJ) is a linearization
// of the patch system's (patch,irho,isigma).
//
class Jacobian
{
public:
// basic meta-info
patch_system& my_patch_system();
public:
// access a matrix element
virtual const fp& operator()(int II, int JJ) const; // rvalue
virtual fp& operator()(int II, int JJ) const; // lvalue
// zero the whole matrix or a single row
virtual void zero();
virtual void zero_row(int II);
// add to an element: Jacobian(II,JJ) += delta
virtual void add_to_element(int II, int JJ, fp delta);
};
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