| aux.fisch | Generate a 2-dimensional discrete Poisson matrix | 
| lsolve.bicg | Biconjugate Gradient method | 
| lsolve.bicgstab | Biconjugate Gradient Stabilized Method | 
| lsolve.cg | Conjugate Gradient method | 
| lsolve.cgs | Conjugate Gradient Squared method | 
| lsolve.cheby | Chebyshev Method | 
| lsolve.gmres | Generalized Minimal Residual method | 
| lsolve.gs | Gauss-Seidel method | 
| lsolve.jacobi | Jacobi method | 
| lsolve.qmr | Quasi Minimal Residual Method | 
| lsolve.sor | Successive Over-Relaxation method | 
| lsolve.ssor | Symmetric Successive Over-Relaxation method | 
| Rlinsolve | A Collection of Iterative Solvers for (Sparse) Linear System of Equations |