# Andrew Knyazev

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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**Content Feed**

How can I get Matlab toolbox KSSOLV? In which package is it?

https://bitbucket.org/berkeleylab/kssolv2.0/src/release/

3 månader ago | 0

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

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

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 |

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

How do read .npy files in matlab?

https://github.com/kwikteam/npy-matlab

mer än 3 år ago | 10

| accepted

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

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

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

LOBPCG Initial k eigenvectors approximation

See https://en.wikipedia.org/wiki/LOBPCG#Convergence_theory_and_practice

ungefär 4 år ago | 0

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

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

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

How to parallel for the computation of eigensystem of a sparse matrix

use SLEPc

mer än 7 år ago | 0

Find max/min eigenvalue of a symmetric matrix

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

mer än 7 år ago | 1

positive-definiteness of a huge sparse matrix

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

mer än 7 år ago | 0

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

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

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

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

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

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

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

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

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