Derivatives on HP 42S

08212018, 12:34 AM
(This post was last modified: 08212018 12:47 AM by Thomas Klemm.)
Post: #7




RE: Derivatives on HP 42S
(08202018 11:54 PM)Albert Chan Wrote: Also, Why use complex numbers to search real extremums ? From The ComplexStep Derivative Approximation: Quote:For a small discrete h, this can be approximated by Since we search for stationary points we set: \(\frac{\partial f}{\partial x}=0\) Which we approximate with just: \(\Im[f(x + ih)]=0\) Cheers Thomas This is why it's a pain point if a calculator claims to support complex numbers but does not implement all functions. Yes, I'm looking at you HP35S! 

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