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HP 41C solver problem
12-07-2017, 03:55 AM
Post: #2
RE: HP 41C solver problem
(12-07-2017 03:17 AM)Trond Wrote:  Hi folks!
I am currently testing out the equation solver (root finder) that came in the Standard Applications book. It seems to work, but then it got stuck on this:

0.0074X^3-100=0

My other two HP calculators find the answer relatively quickly (X=23.82), but the HP41CV just keeps going forever (well, several minutes until I stop it). Any idea why?

The function is smooth and monotonically increasing, and so provided your starting guesses bracket the one simple root, the ROOT program should always converge (or complain if the starting guesses are bad). I keyed in the program (taken from greendyk.nl) and your function, took a look at the function's plot with Wolfram Alpha, gave ROOT starting guesses of 0 and 40, and got the result: 23.8189580802. (Free42, not 41C, but that shouldn't make a difference).

My guess: you made a mistake entering the program. Double-check your code.
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Messages In This Thread
HP 41C solver problem - Trond - 12-07-2017, 03:17 AM
RE: HP 41C solver problem - Thomas Okken - 12-07-2017 03:55 AM
RE: HP 41C solver problem - Trond - 12-07-2017, 04:27 AM
RE: HP 41C solver problem - Thomas Okken - 12-07-2017, 04:23 AM
RE: HP 41C solver problem - Trond - 12-07-2017, 05:08 AM
RE: HP 41C solver problem - Trond - 12-07-2017, 04:38 AM
RE: HP 41C solver problem - AlexFekken - 12-07-2017, 04:46 AM
RE: HP 41C solver problem - Trond - 12-07-2017, 05:43 AM
RE: HP 41C solver problem - Thomas Okken - 12-07-2017, 05:46 AM
RE: HP 41C solver problem - Dieter - 12-07-2017, 10:39 AM
RE: HP 41C solver problem - Thomas Okken - 12-07-2017, 01:56 PM
RE: HP 41C solver problem - Dieter - 12-07-2017, 06:10 PM
RE: HP 41C solver problem - Guenter Schink - 12-07-2017, 07:25 PM
RE: HP 41C solver problem - Trond - 12-07-2017, 03:58 PM
RE: HP 41C solver problem - rprosperi - 12-07-2017, 11:37 PM
RE: HP 41C solver problem - hth - 12-08-2017, 05:13 PM
RE: HP 41C solver problem - Dieter - 12-08-2017, 06:58 PM
RE: HP 41C solver problem - hth - 12-08-2017, 07:25 PM
RE: HP 41C solver problem - Thomas Okken - 12-08-2017, 12:03 AM
RE: HP 41C solver problem - Dieter - 12-08-2017, 07:02 AM
RE: HP 41C solver problem - Thomas Okken - 12-08-2017, 02:50 PM
RE: HP 41C solver problem - Trond - 12-08-2017, 09:20 PM
RE: HP 41C solver problem - rprosperi - 12-08-2017, 11:16 PM
RE: HP 41C solver problem - rprosperi - 12-10-2017, 04:04 PM
RE: HP 41C solver problem - hth - 12-10-2017, 06:37 PM



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