Vector and Parallel Processing — VECPAR 2000 : 4th International Conference Porto Portugal June 21–23 2000 Selected Papers and Invited Talks This book constitutes the thoroughly refereed post proceedings of the 4th International Conference on Vector and Parallel Processing VECPAR 2000 held in Porto Portugal in June 2000. The 40 revised full papers presented were carefully selected and improved during two rounds of reviewing. The papers are orgainized in topical sections on computational grids languages and tools in multiplatform environments cellular automata and applications in computational physics linear and non linear algebra imaging and finite discrete elements in engineering applications