Submitted

majorization check

checks if X is (weakly) majorized by Y, where X and Y must be numeric arrays.

9 years ago | 1 download |

Submitted

pcg.m with 'null' and 'flex' options

Preconditioned Conjugate Gradients handles homogeneous equations and nonsymmetric preconditioning

9 years ago | 1 download |

Submitted

Best polynomial approximation in uniform norm

For a given function on an interval, the code calculates the min-max approximation by a polynomial.

9 years ago | 3 downloads |

Submitted

ODE Tutorial Demo

Advanced examples of using the MATLAB Symbolic Math Toolbox for Ordinary Differential Equations

9 years ago | 3 downloads |

Submitted

Newton's method done right

Newton's method for solving systems of nonlinear equations, including nonsquare and inconsistent

9 years ago | 7 downloads |

Submitted

Laplacian in 1D, 2D, or 3D

Sparse (1-3)D Laplacian on a rectangular grid with exact eigenpairs.

9 years ago | 7 downloads |

Answered

eigs with sparse matrices

try my http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m instead

eigs with sparse matrices

try my http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m instead

13 years ago | 0

Answered

Memory requirements of lobpcg: Matlab and hypre implementation differences

Have you actually tried the development version of SLEPc? The one that one gets by svn checkout http://www.grycap.upv.es/sle...

Memory requirements of lobpcg: Matlab and hypre implementation differences

Have you actually tried the development version of SLEPc? The one that one gets by svn checkout http://www.grycap.upv.es/sle...

13 years ago | 0

Answered

Memory requirements of lobpcg: Matlab and hypre implementation differences

The development version of SLEPc incorporates BLOPEX now, see http://code.google.com/p/blopex/wiki/PETScInstallDevel so that yo...

Memory requirements of lobpcg: Matlab and hypre implementation differences

The development version of SLEPc incorporates BLOPEX now, see http://code.google.com/p/blopex/wiki/PETScInstallDevel so that yo...

13 years ago | 0

Answered

Memory requirements of lobpcg: Matlab and hypre implementation differences

Please try adding the following options to the ij driver: "-hmis -agg_nl 1 -interptype 6 -Pmx 4" These are proposed by a member ...

Memory requirements of lobpcg: Matlab and hypre implementation differences

Please try adding the following options to the ij driver: "-hmis -agg_nl 1 -interptype 6 -Pmx 4" These are proposed by a member ...

13 years ago | 0

Answered

Memory requirements of lobpcg: Matlab and hypre implementation differences

The lobpcg code in hypre is very similar to the MATLAB code, and uses about the same memory. The BoomerAMG preconditioner requir...

Memory requirements of lobpcg: Matlab and hypre implementation differences

The lobpcg code in hypre is very similar to the MATLAB code, and uses about the same memory. The BoomerAMG preconditioner requir...

13 years ago | 0

| accepted

Answered

lobpcg returning incorrect results for large sparse symmetric matrices

Very slow convergence is an expected normal behavior of lobpcg for such a problem, without preconditioning. Unfortunately, I am ...

lobpcg returning incorrect results for large sparse symmetric matrices

Very slow convergence is an expected normal behavior of lobpcg for such a problem, without preconditioning. Unfortunately, I am ...

13 years ago | 1

| accepted

Submitted

matlab2hypre and hypre2matlab

Read and write files with sparse matrices and vectors in hypre format

14 years ago | 1 download |