Andrew Knyazev

Last seen: ungefär 2 månader 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
How can I get Matlab toolbox KSSOLV? In which package is it?
https://bitbucket.org/berkeleylab/kssolv2.0/src/release/

3 månader ago | 0

Answered
Spectral clustering a grpah into k cluster
asdamle/QR-spectral-clustering: Code implements the methodology in arXiv:1609.08251 for multi-way spectral clustering (github.co...

4 månader ago | 0

Answered
eigs with big sparse matrix has Internal error
try running Locally Optimal Block Preconditioned Conjugate Gradient - File Exchange - MATLAB Central (mathworks.com)

4 månader ago | 0

Answered
The eigenvalues of eigs change with the input target, Why?
This may be expected. One can fix it by running with muiltiple targets, collecting all the resulting eigenvectors and writing an...

9 månader ago | 0

Submitted

subspacea - Angles between subspaces
Angles between subspaces and canonical correlations in general scalar products.

10 månader ago | 5 downloads |

Submitted

Locally Optimal Block Preconditioned Conjugate Gradient
LOBPCG solves Hermitian partial generalized eigenvalue problems using preconditioning, as well as PCA

mer än ett år ago | 12 downloads |

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...

mer än 3 år ago | 0

| accepted

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

mer än 3 år ago | 10

| 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...

ungefär 4 år 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...

ungefär 4 år 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...

ungefär 4 år ago | 0

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

ungefär 4 år 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...

ungefär 4 år 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...

ungefär 4 år 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...

ungefär 4 år ago | 0

| accepted

Answered
How to parallel for the computation of eigensystem of a sparse matrix
use SLEPc

mer än 7 år ago | 0

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

mer än 7 år ago | 1

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

mer än 7 år ago | 0

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

mer än 7 år 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

mer än 7 år 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

mer än 7 år ago | 0

| accepted

Answered
Parallel computing of eigs
check SLEPc and BLOPEX

mer än 7 år ago | 1

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...

mer än 7 år 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...

mer än 7 år ago | 0

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

mer än 7 år 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

mer än 7 år ago | 0

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

mer än 7 år 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

mer än 7 år 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

mer än 7 år ago | 0

Submitted

ortha.m
Orthonormalization Relative to matrix A

mer än 7 år ago | 2 downloads |

Andrew Knyazev

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