An overview of NSPCG: A nonsymmetric preconditioned conjugate gradient package
The most recent research-oriented software package developed as part of the ITPACK Project is called NSPCG'' since it contains many nonsymmetric preconditioned conjugate gradient procedures. It is designed to solve large sparse systems of linear algebraic equations by a variety of different interative methods. The coefficient matrix can be passed in one of several different matrix data storage schemes. These sparse data formats allow matrices with a wide range of structures from highly structured ones such as those with all nonzeros along relatively small number of diagonals to completely unstructured sparse matrices. Alternatively, the package allows the user to call the accelerators directly with user-supplied routines for performing certain matrix operations. In this case, one can use the data format from an application program and not be required to copy the matrix into one of the package formats. This is particularly advantageous when memory space is limited. 26 refs.
- Research Organization:
- Texas Univ., Austin, TX (USA). Center for Numerical Analysis
- Sponsoring Organization:
- DOE/ER; National Science Foundation (NSF); SNL
- DOE Contract Number:
- FG05-87ER25048; AS05-81ER10954
- OSTI ID:
- 6756232
- Report Number(s):
- DOE/ER/25048-T3; CNA-228; ON: DE90013970; CNN: DCR-8518722; 06-4298
- Country of Publication:
- United States
- Language:
- English
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