Numerical linear algebra

Conjugate residual method

The conjugate residual method is an iterative numeric method used for solving systems of linear equations. It's a Krylov subspace method very similar to the much more popular conjugate gradient method, with similar construction and convergence properties. This method is used to solve linear equations of the form where A is an invertible and Hermitian matrix, and b is nonzero. The conjugate residual method differs from the closely related conjugate gradient method primarily in that it involves more numerical operations and requires more storage, but the system matrix is only required to be Hermitian, not Hermitian positive definite. Given an (arbitrary) initial estimate of the solution , the method is outlined below: the iteration may be stopped once has been deemed converged. The only difference between this and the conjugate gradient method is the calculation of and (plus the optional incremental calculation of at the end). Note: the above algorithm can be transformed so to make only one symmetric matrix-vector multiplication in each iteration. (Wikipedia).

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Related pages

Conjugate gradient method | Preconditioner | Hermitian matrix