© 2006 The MathWorks, Inc. A Summer experience at The MathWorks Malena I. Español Tufts University

2 Outlines  The company  Timeline  Theory  Implementation  Results

3 The Company Products

4 Timeline JuneJulyAugust Start End MEX Files Tests Bugs More Tests Final Presentation Talk at IPTM Demos + Help ILU(0) ILUC MILU Code Product Code Complex Case CSC Build in

5 Preconditioners

6 ILU(0) A L U = * - R Preconditioner: M=L*U

7 ILU(droptol) A L U Droptol=0 Droptol=0.01 Droptol=0.1

8 Data Structure for Sparse Matrices: MATLAB functions

9 Data Structure for Sparse Matrices: Compressed sparse by columns (CSC)

10 ALGORITHMS  ILU(0) – JKI format – Data Structure – Trick to go through the nonzero elements  ILUC – Crout format – Data Structure  MILU

11 Results...coming!

12 Thanks !!!!