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19 Questions

Votes Activity Newest Views

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answers

views

What is the worst case complexity of Conjugate Gradient?

conjugate-gradient

Mar 21 '16 at 17:19 fred 980

votes

answer

134

views

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

Jul 25 '17 at 10:02 H. Rittich 508

votes

answers

128

views

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

finite-element boundary-conditions reference-request

Nov 16 '17 at 2:40 fred 980

votes

answers

124

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

Oct 15 '15 at 3:23 fred 980

votes

answer

254

views

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

pde boundary-conditions hyperbolic-pde parabolic-pde

Sep 26 '15 at 21:50 Christian Clason 11.3k

votes

answers

138

views

Stokes Equation in “two-fold saddle point” form?

finite-element navier-stokes elliptic-pde

May 5 '16 at 17:55 fred 980

votes

answers

126

views

Does this partial eigen-expansion have a name?

linear-algebra linear-solver eigensystem preconditioning

Oct 24 '15 at 23:39 Community♦ 1

votes

answer

175

views

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

linear-algebra linear-solver gmres

Oct 8 '15 at 13:17 Jesse Chan 2,897

votes

answer

226

views

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

linear-algebra linear-solver helmholtz-equation

Oct 5 '15 at 14:32 fred 980

votes

answers

254

views

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

finite-element pde solid-mechanics

Mar 5 '17 at 20:36 nicoguaro♦ 5,340

votes

answer

views

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

finite-element discontinuous-galerkin elliptic-pde

Apr 13 '16 at 18:59 fred 980

votes

answers

views

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

linear-algebra finite-element iterative-method saddlepoint

Jun 27 '17 at 18:15 fred 980

votes

answer

views

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

linear-algebra linear-solver poisson multigrid spectral-method

Nov 9 '15 at 16:18 fred 980

votes

answers

205

views

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

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

Oct 28 '15 at 6:59 fred 980

votes

answer

137

views

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

pde fourier-analysis

Jul 6 '15 at 13:58 fred 980

vote

answer

217

views

Raviart Thomas Mixed Finite Element with Mixed boundary conditions reference request

finite-element boundary-conditions elliptic-pde

Nov 17 '17 at 15:14 likask 771

vote

answer

153

views

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

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

Jul 5 '17 at 21:27 Rodrigo de Azevedo 682

vote

answer

views

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

finite-element elliptic-pde

Jun 7 '16 at 14:27 fred 980

vote

answers

262

views

Sparse Linear Algebra vs Dense Linear Algebra

linear-algebra sparse-matrix blas

Jun 30 '15 at 1:13 fred 980

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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 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?

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

Stokes Equation in “two-fold saddle point” form?

Does this partial eigen-expansion have a name?

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

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

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?

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

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

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

Raviart Thomas Mixed Finite Element with Mixed boundary conditions reference request

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

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

Sparse Linear Algebra vs Dense Linear Algebra