Add Steffensen's method to the root finders.

emsr / tr29124_test

C++ special math functions

GNU General Public License v3.0

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Closed emsr closed 6 years ago

emsr commented 7 years ago

Steffensen's method is a value-only like Newton with quadratic convergence. No derivative is needed. I think GSL has it wrong.

emsr commented 6 years ago

Done. Easy-peasy.