Derivatives on HP 42S
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08-25-2018, 08:00 PM
Post: #17
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RE: Derivatives on HP 42S
(08-25-2018 07:03 PM)Albert Chan Wrote: seems this is trivial to implement. This sounds a bit like: this is left as an exercise to the dear reader. Quote:If x < 0 and y is odd integer, return -(-x) ^ (1/y), else x ^ (1/y) Unfortunately \(x=\Re[z]\) and \(y=\Im[z]\) aren't analytic functions. So anything based on these values isn't analytic as well. Quote:Just add the check straight into Fx This violates the precondition of this algorithm: the function must be analytical You might get away in this case but it won't work if a stationary point happens to be at the place where you stitch the functions together. Cheers Thomas |
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