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ABSTRACT
In this paper, based on the preconditioners presented by Zhang [A new preconditioner for generalized saddle matrices with highly singular(1,1) blocks. Int J Comput Maths. 2014;91(9):2091-2101], we consider a modified block preconditioner for generalized saddle point matrices whose coefficient matrices have singular (1,1) blocks. Moreover, theoretical analysis gives the eigenvalue distribution, forms of the eigenvectors and the minimal polynomial. Finally, numerical examples show the eigenvalue distribution with the presented preconditioner and confirm our analysis.
Disclosure statement
No potential conflict of interest was reported by the author.
Additional information
Funding
This research is supported by the National Natural Science Foundation of China [11226337, 11501525], Excellent Youth Foundation of Science Technology Innovation of Henan Province [184100510004], Science Technology Innovation Talents in Universities of Henan Province [16HASTIT040, 17HASTIT012], Aeronautical Science Foundation of China [2016ZG55019, 2017ZD55014], Project of Youth Backbone Teachers of Colleges and Universities of Henan Province [2015GGJS-003, 2015GGJS-179], Advanced Technological Research Project of Henan Province [182102110129], Henan Province Postdoctoral Science Foundation [2013031], Research on Innovation Ability Evaluation Index System and Evaluation Model [142400411268].