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Andrew Knyazev


Last seen: 13 dagen ago Active since 2010

http://en.wikipedia.org/wiki/Andrei_Knyazev_(mathematician)

Professional Interests: matrix computations, numerical PDEs, signal, image & video processing, data analytics and mining, data coding and transmission, material sciences, and model predictive control.

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Answered
Eigs in multinode cluster
EIGS has limited support for distributed memory, so you can run it only on a single node, but see the answer from Christine Tob...

meer dan 2 jaar ago | 0

| accepted

Answered
How do read .npy files in matlab?
https://github.com/kwikteam/npy-matlab

meer dan 2 jaar ago | 8

| accepted

Answered
Error returned in Eigs Function " Undefined operator '.*' "
Looks like a bug in chebfun - just make this comment at <https://www.mathworks.com/matlabcentral/fileexchange/47023-chebfun-curr...

ongeveer 3 jaar ago | 0

Answered
eigs does not return the eigenvalues closest to shift sigma
You may also want to try https://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m passing your function handle to it. Co...

ongeveer 3 jaar ago | 0

Answered
find eigenvalues of a very large sparse matrix
If the matrix is real symmetric or Hermitian, you may also want to try https://www.mathworks.com/matlabcentral/fileexchange/48-l...

ongeveer 3 jaar ago | 0

Answered
LOBPCG Initial k eigenvectors approximation
See https://en.wikipedia.org/wiki/LOBPCG#Convergence_theory_and_practice

ongeveer 3 jaar ago | 0

Answered
eigs() runs faster for more eigenvalues of the same matrix
Please check <https://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m> that has probably faster and more predictable co...

ongeveer 3 jaar ago | 1

Answered
How do i obtain only the first principal component?
https://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m can be used as the method for calculating the eigenvector corre...

ongeveer 3 jaar ago | 0

Answered
Smallest non-zero eigenvalue for a generalized eigenvalue problem
Since both matrices A and B are singular, it is not an easy problem numerically. Even eig(full(A), full(B)) may give you wrong a...

ongeveer 3 jaar ago | 0

| accepted

Answered
Find max/min eigenvalue of a symmetric matrix
try http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 1

Answered
Number of eigenvalues when using eigs
This is normal for eigs.

meer dan 6 jaar ago | 0

Answered
positive-definiteness of a huge sparse matrix
try http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 0

Answered
how can i find k-eigenvalues faster than eig for hermitian dense matrix
try http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 0

Answered
Take advantage of Hermitian matrices with eigs
You need to be more specific. Also, try http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 0

| accepted

Answered
Parallel computing of eigs
check SLEPc and BLOPEX

meer dan 6 jaar ago | 0

Answered
Sparse solver for large symmetric matrices
both eigs and http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m can be used in a matrix-free fashion, only needing...

meer dan 6 jaar ago | 0

Answered
Difference between eigs and eig
Is this behavior expected? - Yes. Eigs uses a tricky method that may give the results you describe, especially for funny mat...

meer dan 6 jaar ago | 0

Answered
eigs function: incorrect eigenvectors
This is normal for eigs. If you are happy with eig, just stay with it.

meer dan 6 jaar ago | 0

Answered
Why can't I compute the interior eigenvalues of a sparse matrix with "eigs" without inversion in MATLAB?
check https://www.mathworks.com/matlabcentral/fileexchange/48-locally-optimal-block-preconditioned-conjugate-gradient

meer dan 6 jaar ago | 0

Answered
How can I get the (approximate) eigenvectors of a huge matrix?
try http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 0

Answered
How can I speed up the eigen value and eigen vector computations for a non-sparse matrix?
check http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 0

Answered
How can the Cholesky decomposition step in eigs() be avoided without passing a matrix to eigs that is a Cholesky decomposition?
check http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m

meer dan 6 jaar ago | 0

Answered
eigs with sparse matrices
try my http://www.mathworks.com/matlabcentral/fileexchange/48-lobpcg-m instead

ongeveer 10 jaar 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...

ongeveer 10 jaar 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...

ongeveer 10 jaar 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 ...

ongeveer 10 jaar 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...

meer dan 10 jaar 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 ...

meer dan 10 jaar ago | 1

| accepted