Derivatives on HP 42S

08252018, 07:03 PM
(This post was last modified: 08252018 07:48 PM by Albert Chan.)
Post: #16




RE: Derivatives on HP 42S
(08252018 05:19 PM)lrdheat Wrote: This is why, if just 1 function could be added to the HP 42S, I would choose xROOTy ! seems this is trivial to implement. If x < 0 and y is odd integer, return (x) ^ (1/y), else x ^ (1/y) If you knew y is odd integer, it is even simpler, just check sign of x. This avoids the extremum search returning complex results. Just add the check straight into Fx Edit: complex number don't understand x < 0, may be real part of x instead ? 

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