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Derivatives on HP 42S
08-25-2018, 08:00 PM
Post: #17
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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Messages In This Thread
Derivatives on HP 42S - lrdheat - 08-20-2018, 03:03 AM
RE: Derivatives on HP 42S - Thomas Klemm - 08-20-2018, 04:38 AM
RE: Derivatives on HP 42S - Thomas Klemm - 08-20-2018, 07:43 AM
RE: Derivatives on HP 42S - Albert Chan - 08-20-2018, 11:54 PM
RE: Derivatives on HP 42S - lrdheat - 08-20-2018, 10:57 PM
RE: Derivatives on HP 42S - Thomas Klemm - 08-20-2018, 11:43 PM
RE: Derivatives on HP 42S - Thomas Klemm - 08-21-2018, 12:34 AM
RE: Derivatives on HP 42S - Thomas Klemm - 08-21-2018, 01:35 AM
RE: Derivatives on HP 42S - lrdheat - 08-21-2018, 02:24 AM
RE: Derivatives on HP 42S - Thomas Klemm - 08-21-2018, 06:14 AM
RE: Derivatives on HP 42S - RMollov - 08-23-2018, 12:58 PM
RE: Derivatives on HP 42S - lrdheat - 08-24-2018, 02:51 AM
RE: Derivatives on HP 42S - Thomas Klemm - 08-24-2018, 05:52 AM
RE: Derivatives on HP 42S - lrdheat - 08-25-2018, 05:19 PM
RE: Derivatives on HP 42S - Albert Chan - 08-25-2018, 07:03 PM
RE: Derivatives on HP 42S - Thomas Klemm - 08-25-2018, 06:05 PM
RE: Derivatives on HP 42S - Thomas Klemm - 08-25-2018 08:00 PM
RE: Derivatives on HP 42S - Albert Chan - 08-25-2018, 09:20 PM
RE: Derivatives on HP 42S - Thomas Klemm - 08-26-2018, 04:54 AM
RE: Derivatives on HP 42S - Thomas Okken - 08-26-2018, 01:54 PM
RE: Derivatives on HP 42S - lrdheat - 08-26-2018, 04:47 PM
RE: Derivatives on HP 42S - Albert Chan - 08-26-2018, 08:39 PM
RE: Derivatives on HP 42S - Thomas Klemm - 08-26-2018, 08:00 PM
RE: Derivatives on HP 42S - Albert Chan - 08-29-2018, 01:52 PM



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