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The phase-type matrix has a large number of symmetries (it is Toeplitz block tridiagonal). This should produce a much easier means of computing the matrix exponential.
Benchmark and optimise. How m…
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When inspecting the Shur complementary portfolio, I encountered some issues.
In the formulation of your presentation this can be found:
![1*WJUNzwuJfEXrJmD0Qkot6g](https://github.com/micropred…
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We still don't have a gradient implementation for `Eig` (and a few other `aesara.linalg` `Op`s like https://github.com/aesara-devs/aesara/issues/836). [Here's](https://github.com/aesara-devs/aesara/p…
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`ultraSEM` is currently slower than `specdd`, e.g. for variable-coefficient problems with many elements and moderate `p`. What optimizations can we make to `ultraSEM` to speed it up?
Some ideas:
…
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George, please review the files in the following order (it's perfectly okay if you don't finish everything):
1. core.py
2. partition.py
3. k_shape.py
4. skew_partition.py
5. root_idea…
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Dear all
I'm trying to use BoomerAMG as a preconditioner to solve a 3D laplace problem which is assembled by a finite element code.
I have the particular problem, that a small number of the basis …
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I noticed that the following fails:
``` julia
B = randn(100,100);
A = view(B,1:50,1:50)
schurfact!(A)
```
The reason is that the `Schur` immutable assumes that `T` and `Z` are of the same type:
```…
Jutho updated
8 years ago
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Hi, I get this error :
scipy.sparse.linalg.eigen.arpack.arpack.ArpackError: ARPACK error 1: The Schur form computed by LAPACK routine dlahqr could not be reordered byLAPACK routine dtrsen. Re-ente…
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I have fixed many of the problems with systems in ODE.py. See the attached notebook (its Python 3 -- huge native Jordan exp takes several pages -- useful info but definitely skip ahead):
But I ne…
emath updated
4 years ago
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Hi,
I’m trying to find the roots of a polynomial, and nalgebra has overall worked great.
Recently, I’ve found that my calculations hang on certain inputs, for which numpy immediately returns a v…