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### Describe your issue.
The OptimizeResult returned by `scipy.optimize.minimize(method='Powell')` expresses the optimal value of the function `fun` as a numpy scalar instead of a python float
```…
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## Problem Description
I've encountered a residual jump at each restart step within the inner iteration of a restarted GMRES while using geometrical multigrid precondition and matrix free operator.
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## Bug Description
There was a recent libmesh implementation that detects if there are stateful quantities in a problem. This is really useful to detect cyclic dependencies on auxkernels, postprocess…
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~~Convergence history is non deterministic when running the RANS solver with SA model using OMP-only parallelism. When fixing the min RMS residual, the computation stops at a different iteration each …
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Hi JAX developers,
I'm wondering if it's possible to calculate `jvp` for intermediate variables defined in a function. Here's an example:
```
def f(x, params_1, params_2, params_3):
W1, …
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MWE of preconditioned Newton-Krylov solves with OrdinaryDiffEq and Sundials:
```julia
using OrdinaryDiffEq, LinearSolve, Test
const N = 32
const xyd_brusselator = range(0,stop=1,length=N)
bru…
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Some functions have sparse Jacobian or sparse Hessian and it can be usefull to obtain them as sparse matrices rather than accessing to the values through vector-jacobian or vector-hessian products fu…
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Hi,
Would it be possible to ask the user the functions a,b,c and for a robin BC and it will provide an `equation` to solve:
`∇(a(x,u)∇u) + ∇(b(x,u)u) + c(x,u) u = 0`
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We need a way to handle part of the operators implicitly. To reduce the scope of this problem, initially we will only consider:
- linear operators
- on a single field (or where the same stencil is…