Function - Find root
10-16-2021, 01:31 PM
Post: #6
 Wes Loewer Senior Member Posts: 456 Joined: Jan 2014
RE: Function - Find root
(10-15-2021 03:20 PM)Arno K Wrote:  But at least it is the same behaviour as my 50G shows when I solve this equation,

An error message indicating that you gave it a "bad initial guess" would be better, but at least the Prime tells you that it found an "Extremum" rather than a root. The 50g actually labels this incorrect point as a "Root".

On the 84+, a bad initial interval produces the error message: "ERROR: NO SIGN CHANGE" which probably isn't much help to a student who doesn't understand the basics of searching for roots.

The Nspire probably has the clearest error message: "Error: No zero found within the specified bounds."

On the Prime, the help screen says, "Root: find the root of the current function that is closest to the tracer". So perhaps the error message should say something like: "No root found near the tracer."
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 Messages In This Thread Function - Find root - StephanP - 10-15-2021, 12:01 PM RE: Function - Find root - Arno K - 10-15-2021, 02:03 PM RE: Function - Find root - StephanP - 10-15-2021, 02:13 PM RE: Function - Find root - StephanP - 10-15-2021, 02:23 PM RE: Function - Find root - Albert Chan - 10-16-2021, 01:59 PM RE: Function - Find root - Wes Loewer - 10-17-2021, 03:34 AM RE: Function - Find root - jte - 01-07-2022, 05:32 AM RE: Function - Find root - jte - 01-07-2022, 05:44 AM RE: Function - Find root - Arno K - 10-15-2021, 03:20 PM RE: Function - Find root - Wes Loewer - 10-16-2021 01:31 PM RE: Function - Find root - jte - 01-07-2022, 03:38 AM RE: Function - Find root - ObiWanKenobi - 01-10-2022, 02:49 PM

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