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Avoid repeatly operator assignment in NekNonlinSysNewton class

Jacques Xing requested to merge CFD-Xing/nektar:set-non-linear-operator-constructor into master

Issue/feature addressed

In the NekNonlinSysNewton class, the linear system operator is reset every time the non-linear system is being solved. This can be avoiding by properly subclassing the SetSysOperators function.

Proposed solution

Implementation

Tests

Suggested reviewers

Please suggest any people who would be appropriate to review your code.

Notes

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Checklist

  • [ ] Functions and classes, or changes to them, are documented.
  • [ ] User guide/documentation is updated.
  • Changelog is updated.
  • [ ] Suitable tests added for new functionality.
  • Contributed code is correctly formatted. (See the contributing guidelines).
  • [ ] License added to any new files.
  • No extraneous files have been added (e.g. compiler output or test data files).
Edited by Jacques Xing

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