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sunshine

I am a new graduate majoring in matrix computations, mainly studying Krylov subspace iterative methods and preconditioning techniques. and saddle point problems.

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  • Nanjing, China
  • Member for 1 year, 11 months
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  • Last seen Jun 7 at 6:48

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7 Does a symmetric positive definite matrix also have $\mathbf{A} = \mathbf{L}^T\mathbf{L}$ (where $\mathbf{L}$ is a lower triangular matrix)? Nov 5 '19
5 Why the two Gram-Schmidt algorithms produce different results for qr factorization? Jan 16 '20
5 Why MATLAB chooses the Householder in its built-in function gmres.m? Dec 13 '19
4 How to use matlab command 'fft' to solve Ax=b arising from Poisson equation? Oct 30 '19
3 Why iterative method: AMG preconditioned PCG is slower than Matlab direct method 'A\b'? Sep 1 '19
3 Why do many people use FDM method to solve Stokes equations, i.e., saddle point matrix? Sep 5 '19
3 How does gmres method iteration behave for this non-diagonalizable matrix? Nov 4 '19
3 What is the **contraction factor and convergence factor** of a iteration method? Nov 21 '19
3 Are there any other better methods than block diagnoal and block upper triangular precondtioner for saddle point problems? Nov 25 '19
3 Does the k-th approximate solution of a stationary iteration belong to the k-th Krylov subspace? Dec 5 '19
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