ACM Transactions on Mathematical Software (TOMS): Volume 44 Issue 1, July 2017
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SYM-ILDL is a numerical software package that computes incomplete LDL T (ILDL) factorizations of symmetric indefinite and real skew-symmetric matrices. The core of the algorithm is a Crout variant of incomplete LU (ILU), originally introduced and implemented for symmetric matrices by Li and Saad . Our code is economical in ...
Symmetric indefinite, Skew-symmetric matrices