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math.NA2018
Approximating the extreme Ritz values and upper bounds for the -norm of the error in CG
Gérard Meurant, Petr Tichý
In practical conjugate gradient (CG) computations it is important to monitor the quality of the approximate solution to so that the CG algorithm can be stopped when the requ…
math.NA2018
Characterization of half-radial matrices
Iveta Hnetynkova, Petr Tichy
Numerical radius is the radius of the smallest ball with the center at zero containing the field of values of a given square matrix . It is well known that $r(A)\leq \|A\…