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The examples demonstrate how to use the various tools for root finding.
We start with the simple cube root function cbrt
( C++ standard function name cbrt)
showing root finding without
derivatives.
We then show how use of derivatives can improve the speed of convergence.
(But these examples are only a demonstration and do not try to make the ultimate
improvements of an 'industrial-strength' implementation, for example, of
boost::math::cbrt
, mainly by using a better computed
initial 'guess' at cbrt.hpp).
Then we show how a higher root (fifth root) 5√ can be computed, and in root_finding_n_example.cpp a generic method for the nth root that constructs the derivatives at compile-time.
These methods should be applicable to other functions that can be differentiated easily.