Group Langemyr

Group Description 
FEM structural mechanics matrix from Lars Langemyr, COMSOL.

This is one of the few matrices for which a pivot tolerance of 0.1 (in UMFPACK
V4.0) is not sufficient.  An inaccurate solution is found with that tolerance.

Penny Anderson, of The MathWorks, Inc, solved the problem in MATLAB 6.5 by
detecting a poor solution and automatically refactorizing with a pivot
tolerance of 1.0.
Displaying 1 collection matrix
Id Name Group Rows Cols Nonzeros Kind Date Download File
864 comsol Langemyr 1,500 1,500 97,645 Structural Problem 2002 MATLAB Rutherford Boeing Matrix Market