Research Article
Preconditioning Complex Symmetric Linear Systems
Table 2
Numerical results for COCG and COCR preconditioned on the basis of the matrix ( + ) with complete Cholesky decomposition (), with incomplete Cholesky (IC), and with incomplete Cholesky with threshold (IC0). The reported numbers represent the iterations of the corresponding solver with the specified preconditioner. The dash indicates that it was not feasible to compute a particular test. The stopping tolerance was . The column “preconditioner” shows the time required to assemble the preconditioner. The time elapsed in the computation is expressed in seconds.
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