GNU Octave - Bugs: bug #54445, fzero doesn't (always) accept...

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bug #54445: fzero doesn't (always) accept initial value 0

Submitter:	Olaf Till <i7tiol>
Submitted:	Sat 04 Aug 2018 04:24:18 PM UTC


Category:	Octave Function	Severity:	3 - Normal
Priority:	5 - Normal	Item Group:	Regression
Status:	Fixed	Assigned to:	None
Originator Name:	Olaf Till	Open/Closed: *	Closed
Release: *	4.4.0	Operating System: *	GNU/Linux
Fixed Release:	None	Planned Release:	None

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Mon 06 Aug 2018 04:24:50 AM UTC, comment #3: I modified the changeset to remove the change regarding slope0. slope0 is the initial slope and has to be computed at the start so that it can be compared later to the actual slope at the solution. But it isn't a problem, because when the first issue with bracketing is fixed then b and a can no longer be the same and (b - a) is no longer zero. For the final cset see https://hg.savannah.gnu.org/hgweb/octave/rev/092bb49b6962. Marking as fixed and closing report.	Rik <rik5>
Mon 06 Aug 2018 03:39:14 AM UTC, comment #2: Marking as a regression as well since this worked in 4.2.2. I will take a look at Marco's patch. I was in the midst of updating other parts of fzero.m anyways.	Rik <rik5>
Sun 05 Aug 2018 09:26:21 AM UTC, comment #1: They are two different bugs, although both related to the initial bracketing. The attached patch solves both problems for me. (file #44712)	Marco Caliari <caliari>
Sat 04 Aug 2018 04:24:18 PM UTC, original submission: fzero doesn't (always) accept initial value 0 any more: octave:4> fzero (@ (x) x + 1, 1) ans = -1 octave:5> fzero (@ (x) x + 1, 0) error: fzero: not a valid initial bracketing error: called from fzero at line 178 column 5 Maybe unrelated (sorry): octave:3> fzero (@ (x) x, 0) warning: division by zero warning: called from fzero at line 181 column 10 ans = 0	Olaf Till <i7tiol>

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Attached Files

file #44712: fzero.diff added by caliari (2KiB - application/x-tex)

Depends on the following items: None found

Items that depend on this one: None found

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Follow 5 latest changes.

Date	Changed by	Updated Field	Previous Value	Replaced by
2018-08-06	rik5	Status	Patch Submitted	Fixed
		Open/Closed	Open	Closed
2018-08-06	rik5	Item Group	Unexpected Error or Warning	Regression
2018-08-05	caliari	Attached File	-	Added fzero.diff, #44712
		Status	None	Patch Submitted

GNU Octave - Bugs: bug #54445, fzero doesn't (always) accept...

bug #54445: fzero doesn't (always) accept initial value 0

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