# Package cern.colt.matrix.tdouble.algo.solver

**Iterative solvers**BiCG - BiConjugate gradients. BiCGstab - BiConjugate gradients stabilized. CG - Conjugate gradients. CGS - Conjugate gradients squared. Chebyshev - The Chebyshev iteration for symmetrical, positive definite matrices. GMRES - Generalized minimal residual using restart. IR - Iterative refinement (Richardson's method). QMR - Quasi-minimal residual. HyBR - Hybrid Bidiagonalization Regularization. MRNSD - Modified Residual Norm Steepest Descent. CGLS - Conjugate Gradient for Least Squares.

See: Description

Interface Summary Interface Description DoubleIterationMonitor Monitors the iterative solution process for convergence and divergence.DoubleIterationReporter Reports on the progress of an iterative solverDoubleIterativeSolver Iterative linear solver.Class Summary Class Description AbstractDoubleIterationMonitor Partial implementation of an iteration reporterAbstractDoubleIterativeSolver Partial implementation of an iterative solverCGLSDoubleIterationMonitor DefaultDoubleIterationMonitor Default iteration monitor.DoubleBiCG BiCG solver.DoubleBiCGstab BiCG stablized solver.DoubleCG Conjugate Gradients solver.DoubleCGLS CGLS is Conjugate Gradient for Least Squares method used for solving large-scale, ill-posed inverse problems of the form: b = A*x + noise.DoubleCGS Conjugate Gradients squared solver.DoubleChebyshev Chebyshev solver.DoubleGivensRotation Givens plane rotationDoubleGMRES GMRES solver.DoubleHyBR HyBR is a Hybrid Bidiagonalization Regularization method used for solving large-scale, ill-posed inverse problems of the form: b = A*x + noise The method combines an iterative Lanczos Bidiagonalization (LBD) Method with an SVD-based regularization method to stabilize the semiconvergence behavior that is characteristic of many ill-posed problems.DoubleIR Iterative Refinement.DoubleMRNSD MRNSD is Modified Residual Norm Steepest Descent method used for solving large-scale, ill-posed inverse problems of the form: b = A*x + noise.DoubleQMR Quasi-Minimal Residual method.HyBRDoubleIterationMonitor MRNSDDoubleIterationMonitor NoDoubleIterationReporter An iteration reporter which does nothing.Enum Summary Enum Description DoubleNotConvergedException.Reason Possible reasons for lack of convergenceHyBRInnerSolver HyBRRegularizationMethod Exception Summary Exception Description DoubleNotConvergedException Signals lack of convergence of an iterative processIterativeSolverDoubleNotConvergedException Exception for lack of convergence in a linear problem.

## Package cern.colt.matrix.tdouble.algo.solver Description

**Iterative solvers**

- BiCG - BiConjugate gradients.
- BiCGstab - BiConjugate gradients stabilized.
- CG - Conjugate gradients.
- CGS - Conjugate gradients squared.
- Chebyshev - The Chebyshev iteration for symmetrical, positive definite matrices.
- GMRES - Generalized minimal residual using restart.
- IR - Iterative refinement (Richardson's method).
- QMR - Quasi-minimal residual.
- HyBR - Hybrid Bidiagonalization Regularization.
- MRNSD - Modified Residual Norm Steepest Descent.
- CGLS - Conjugate Gradient for Least Squares.

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