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Andrew Knyazev


Last seen: 8 Monate vor |  Aktiv seit 2010

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

9 Monate vor | 0

Beantwortet
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...

10 Monate vor | 0

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

10 Monate vor | 0

Beantwortet
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...

mehr als ein Jahr vor | 0

Beantwortet
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...

fast 4 Jahre vor | 0

| akzeptiert

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

fast 4 Jahre vor | 13

| akzeptiert

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

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

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 1

Beantwortet
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...

mehr als 4 Jahre vor | 0

Beantwortet
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...

mehr als 4 Jahre vor | 0

| akzeptiert

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

fast 8 Jahre vor | 0

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

fast 8 Jahre vor | 1

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

fast 8 Jahre vor | 0

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

fast 8 Jahre vor | 0

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

fast 8 Jahre vor | 0

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

fast 8 Jahre vor | 0

| akzeptiert

Beantwortet
Parallel computing of eigs
check SLEPc and BLOPEX

fast 8 Jahre vor | 1

Beantwortet
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...

fast 8 Jahre vor | 0

Beantwortet
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...

fast 8 Jahre vor | 0

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

fast 8 Jahre vor | 0

Beantwortet
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

fast 8 Jahre vor | 0

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

fast 8 Jahre vor | 0

Beantwortet
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

fast 8 Jahre vor | 0

Beantwortet
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

fast 8 Jahre vor | 0

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

mehr als 11 Jahre vor | 0

Beantwortet
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...

mehr als 11 Jahre vor | 0

Beantwortet
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...

mehr als 11 Jahre vor | 0

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