Opaque functions and fsolve / numerical methods

[roadrunner]

(04-08-2021 04:54 AM)compaqdrew Wrote:  How did you figure that out?

I guess just from reading this forum for the last gillion years or so.

fsolve uses bisection and i believe it does do numerical solutions; i think CAS just solves the equation differently and sends that to fsolve. Maybe the prime gurus can chime in on that one.

Because bisection usually doesn't like discontinuities I was surprised fsolve found both solutions separated by one. In general you will probably have to give it a range to search in that avoids discontinuities.

-road