On Software Support for Finite Difference Schemes Based on Index Notation

  • Authors:
  • Krister Åhlander;Kurt Otto

  • Affiliations:
  • -;-

  • Venue:
  • ICCS '02 Proceedings of the International Conference on Computational Science-Part III
  • Year:
  • 2002

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Abstract

A formulation of finite difference schemes based on the index notation of tensor algebra is advocated. Finite difference operators on regular grids may be described as sparse, banded, "tensors". Especially for 3D, it is claimed that index notation better corresponds to the inherent problem structure than does conventional matrix notation. The transition from mathematical index notation to implementation is discussed. Software support for index notation that obeys the Einstein summation convention has been implemented in the C++ package Ein-Sum. The extension of EinSum to support typical data structures of finite difference schemes is outlined. A combination of general index notation software and special-purpose routines for instance for fast transforms is envisioned.