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Avoid repeatly operator assignment in NekNonlinSysNewton class

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

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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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