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Make "sparse" solver check if equations are linear. #860

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Make "sparse" solver check if equations are linear. #860

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Commits on May 5, 2022

  1. Make "sparse" solver check if equations are linear. 

    If the system is linear, then newtons method always converges
in exactly one iteration. When using the sparse solver on
linear systems omit the newtons iteration and solve directly.

This should make the resulting code run marginally faster by
skipping the check for convergence. Currently the check for
convergence is implemented as "error = sqrt(|F|^2)".
    @ctrl-z-9000-times
    ctrl-z-9000-times committed May 5, 2022
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