Step 2: Create concrete implementations of the NOX::Abstract classes

NOX abstract classes

NOX's flexibility is based on the fact that it does not depend on any particular linear algebra package. In order to interface to NOX, the user needs to supply methods that derive from the following abstract classes:

The Vector supports basic vector operations such as dot products and so on. The Group supports the linear algebra functionality as well as the interface to evaluate the function and, optionally, the Jacobian. Complete details are provided in the class descriptions.

In order to link your code to NOX, you have to write your own instantiation of the NOX::Abstract::Vector and NOX::Abstract::Group classes (see Writing your own instantiation) or use one of the predefined implementations (see Instantiations provided with NOX).

Writing your own instantiation

We recommend using the NOX::LAPACK framework as a guide. In this case, the underlying vectors of C++ STL vector<double> objects, and the matrices are stored in our own NOX::LAPACK::Matrix class. Both the vectors and matrices are manipulated using LAPACK. The NOX::LAPACK::Vector is straightforward; see NOX_LAPACK_Vector.H and NOX_LAPACK_Vector.C. The NOX::LAPACK::Group uses the NOX::LAPACK::Vector and NOX::LAPACK::Matrix objects. The interface with the application is handled in a separate class (NOX::LAPACK::Interface) that is passed to the NOX::LAPACK::Group when it is constructed.

The NOX header files should be installed in /usr/local/include/nox.

Instantiations provided with NOX

NOX includes three ready-made instantiations.

If you have problems...

If you have problems configuring and compiling NOX, please report them using Bugzilla; see Reporting Bugs and Making Enhancement Requests for more information.

Moving on...

Go on to Step 3: Call NOX from your code.
Generated on Thu Sep 18 12:43:29 2008 for NOX by doxygen