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### Details
It seems that `scc` array is allocated, maintained but not accessed by actual `diag_zhegvx` procedure of reduced basis set.
In `diago_david.cpp`,
`scc` is updated and referenced her…
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Add support to find out the Eigenvectors and Eigenvalues of sparse matrix.
To this end use ARPACK library.
The library is here
https://www.caam.rice.edu/software/ARPACK/
- [x] Symmetric matrix s…
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Arpack v0.5.3: The generalized eigenvalue problem with symmetric matrices should return real eigenvalues and real eigenvectors. The `eigs` function fails to do that:
```
using LinearAlgebra
using S…
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Some applications require an arbitrary sorting of eigenvalues in a Schur decomposition. Currently, `ordschur` supports re-ordering with a logical `select` vector that effectively groups the eigenvalu…
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hi dear friend:
I checked your heig2.m file, but I could not understand what does this file do please?
I guess this file is doing "the generalized eigenvalue decomposition", but from your computatio…
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I have compared the result of `SymGEigsShiftSolver` if compiled with and without `-DEIGEN_DEFAULT_TO_ROW_MAJOR`.
It seems that internally some types are hard-coded to default to col-major ordering an…
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1) If nh ≤ N
Find the generalized eigenvectors v2,vv3,...,vvno+1 of
(20) corresponding to the second through the no + 1
smallest eigenvalues. Let β = [v2,v3,...,vno+1],where
vi = vi/Hvi, i = 2,…
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LOBPCG is a sparse matrix diagonalization method that produces the minimal eigenvalue. This could possibly be a nice alternative to ARPACK for detecting negative modes? It's worth looking into, anyw…
ExpHP updated
4 years ago
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The `GeneralizedEigen` type is not really a factorization right now. From `F=eigfact(A,B)` you cannot recreate `A` and `B`. There are an easy problem and a hard problem here.
- [ ] First of all, we'll…
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Can anyone here help me please: which problems have 2 matrices A, M for Ax = λ Mx
(the generalized eigenvalue problem) ?
I'd have thought that all "Structural problems" would -- not so.
Thanks,
ch…