interface for scientific computing in C++

 The Template Numerical Toolkit (TNT) is a collection of interfaces and
 reference implementations of numerical objects useful for scientific
 computing in C++. The toolkit defines interfaces for basic data
 structures, such as multidimensional arrays and sparse matrices,
 commonly used in numerical applications. The goal of this package is to
 provide reusable software components that address many of the portability
 and maintenance problems with C++ codes.
 .
 TNT provides a distinction between interfaces and implementations of TNT
 components. For example, there is a TNT interface for two-dimensional
 arrays which describes how individual elements are accessed and how
 certain information, such as the array dimensions, can be used in
 algorithms; however, there can be several implementations of such an
 interface: one that uses expression templates, or one that uses BLAS
 kernels, or another that is instrumented to provide debugging information.
 By specifying only the interface, applications codes may utilize such
 algorithms, while giving library developers the greatest flexibility in
 employing optimization or portability strategies.
 .
  Homepage: http://math.nist.gov/tnt/