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Currently QuTiP solvers are pure batch jobs. One calls a function, e.g. `mesolve`, which then runs until the state has been propagated to all requested time steps and then the function returns the res…
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Hello,
when trying to run the examples from the User Guides in the Bloch-Redfield master equation section
( http://qutip.org/docs/4.0.2/guide/dynamics/dynamics-bloch-redfield.html ) I get an error…
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The table of contents in the [`index.ipynb`](https://github.com/qutip/qutip-notebooks/blob/master/index.ipynb) does not match the table of contents on the [qutip tutorials page](https://qutip.org/tuto…
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I (Stefan @Krastanov ) edited this issue to give some context. @Mulliken reported below a performance issue due to using a sparse initial state matrix in `timeevolution.master`. A large array of spars…
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This list tracks the compatibility status of packages that depend on or support NumPy. If "compatible release on PyPI" does not say "yes" but a version number is listed: this is based on plans announc…
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Matrix exponentiation is a costly operation. See [1][Nineteen Dubious Ways to Compute the Exponential of a Matrix, Twenty-Five Years Later∗](https://www.cs.cornell.edu/cv/ResearchPDF/19ways%2B.pdf).
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Some packages in the requirements.txt are not up to date.
Pandas, NumPy and lmfit are the ones that I saw.
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### Describe your issue.
The sparse eigen solver segfault with version 1.11.4 on github action.
We run a series of automated test and only one specific cases fail and I can't reproduce it locally.
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### Bug Description
The sparse eigensolver can fail when eigenvalues are purely imaginary.
### Code to Reproduce the Bug
```shell
import qutip
(qutip.num(4) * 1j).eigenenergies(sparse=True)
```
…
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What will make this tricky is to build the documentation without cupy being present, but probably we can make a plan.