Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Limited-Memory Variable Metric Methods that use Quantities from the Preceding Iteration
Vlček, Jan ; Lukšan, Ladislav
In this contribution, a new family of globally convergent limited-memory (LM) variable metric (VM) line search methods for unconstrained minimization is presented. Numerical results indicate that the new methods can save computational time substantially for certain problems in comparison with the well-known L-BFGS method.
Robust Preconditioners for the Matrix Free Truncated Newton Method
Lukšan, Ladislav ; Matonoha, Ctirad ; Vlček, Jan
New positive definite preconditioners for the matrix free truncated Newton method are given. Corresponding algorithms are described in detail. Results of numerical experiments that confirm the efficiency and robustness of the preconditioned truncated Newton method are reported.

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