User fred

9 votes

2 answers

2k views

What is the worst case complexity of Conjugate Gradient?

conjugate-gradient

asked Mar 17, 2016 at 15:49

7 votes

1 answer

152 views

What are some ideas to preprocess / precondition the following linear system?

asked Oct 16, 2015 at 14:44

6 votes

1 answer

278 views

Do the class of PDEs that lack initial conditions have a name?

pde boundary-conditions hyperbolic-pde parabolic-pde

asked Sep 26, 2015 at 17:31

6 votes

0 answers

145 views

Do practice and theory differ substantially when implementing Neumann Boundary Conditions using a Mixed Method?

finite-element boundary-conditions reference-request

asked Nov 16, 2017 at 2:40

6 votes

0 answers

126 views

What strategies / decompositions would be useful to solve the following linear system repeatedly if I only care about time to solution?

linear-algebra linear-solver eigensystem block-decomposition

asked Oct 14, 2015 at 21:45

5 votes

2 answers

157 views

Stokes Equation in "two-fold saddle point" form?

finite-element navier-stokes elliptic-pde

asked Apr 25, 2016 at 1:51

5 votes

1 answer

232 views

What is a good way to solve the following linear system? (repeatedly)

linear-algebra linear-solver helmholtz-equation

asked Oct 1, 2015 at 21:02

5 votes

1 answer

200 views

What factors are relevant when deciding between GMRES and schur complement solves?

linear-algebra linear-solver gmres

asked Oct 7, 2015 at 14:18

5 votes

2 answers

132 views

Does this partial eigen-expansion have a name?

linear-algebra linear-solver eigensystem preconditioning

asked Oct 23, 2015 at 13:27

4 votes

2 answers

477 views

Why does the displacement have to be small to use the infintesimal strain elasticity equations?

finite-element pde solid-mechanics

asked Jan 30, 2017 at 2:14

3 votes

1 answer

107 views

In mixed elliptic formulation, what are the weakest requirements to ensure the flux is in $H^1$?

finite-element discontinuous-galerkin elliptic-pde

asked Apr 13, 2016 at 18:10

2 votes

0 answers

75 views

How can I numerically solve a saddle point problem with repeated constraints?

linear-algebra finite-element iterative-method saddlepoint

asked Jun 27, 2017 at 18:08

2 votes

0 answers

278 views

Does Conjugate Residual really have convergence properties similar to that of Conjugate Gradient?

linear-algebra linear-solver iterative-method krylov-method

asked Oct 28, 2015 at 6:59

2 votes

1 answer

75 views

Solving new linear system that comes from an $p$ enrichment

linear-algebra linear-solver poisson multigrid spectral-method

asked Nov 8, 2015 at 17:16

2 votes

0 answers

323 views

Sparse Linear Algebra vs Dense Linear Algebra

linear-algebra sparse-matrix blas

asked Jun 30, 2015 at 1:13

2 votes

1 answer

145 views

Bounded Input Boundaed Output stability for heat equation. Proof or Counter example?

pde fourier-analysis

asked Jul 3, 2015 at 21:36

1 vote

1 answer

159 views

How can I solve on a computer a large projection problem with redundant constraints?

linear-algebra optimization convex-optimization constrained-optimization quadratic-programming

asked Jun 28, 2017 at 16:25

1 vote

1 answer

318 views

Raviart Thomas Mixed Finite Element with Mixed boundary conditions reference request

finite-element boundary-conditions elliptic-pde

asked Nov 16, 2017 at 19:51

1 vote

1 answer

101 views

Does a mixed method solve this elliptic pde exactly if the source function is piecewise polynomial?

finite-element elliptic-pde

asked Jun 6, 2016 at 16:23

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19 Questions

What is the worst case complexity of Conjugate Gradient?

What are some ideas to preprocess / precondition the following linear system?

Do the class of PDEs that lack initial conditions have a name?

Do practice and theory differ substantially when implementing Neumann Boundary Conditions using a Mixed Method?

What strategies / decompositions would be useful to solve the following linear system repeatedly if I only care about time to solution?

Stokes Equation in "two-fold saddle point" form?

What is a good way to solve the following linear system? (repeatedly)

What factors are relevant when deciding between GMRES and schur complement solves?

Does this partial eigen-expansion have a name?

Why does the displacement have to be small to use the infintesimal strain elasticity equations?

In mixed elliptic formulation, what are the weakest requirements to ensure the flux is in $H^1$?

How can I numerically solve a saddle point problem with repeated constraints?

Does Conjugate Residual really have convergence properties similar to that of Conjugate Gradient?

Solving new linear system that comes from an $p$ enrichment

Sparse Linear Algebra vs Dense Linear Algebra

Bounded Input Boundaed Output stability for heat equation. Proof or Counter example?

How can I solve on a computer a large projection problem with redundant constraints?

Raviart Thomas Mixed Finite Element with Mixed boundary conditions reference request

Does a mixed method solve this elliptic pde exactly if the source function is piecewise polynomial?