Contractor Report 172150 leASE NASA - CR - 172150 19830020669

Tbis paper describes a preconditioned conjugate gradient method tbat can be effectively implemented on both vector machines and parallel arrays to solve sparse symmetric and positive definite systema of linear equations. The implementation on the CYBER 203/205 and on tbe Finite Element Machine is discuased and result a obtained using the method on these machines are siven.