bugGNU Octave - Bugs: bug #62451, xlim([]) gives irritating error...


bug #62451: xlim([]) gives irritating error message

Submitted by:  Hartmut <hardy>
Submitted on:  Fri 13 May 2022 09:51:52 AM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Fixed Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * 7.1.0 Operating System:  * Any
* Mandatory Fields

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Mon 16 May 2022 08:53:26 PM UTC, comment #3: 

Thanks for the fix.

But doesn't xlim.m need any input validation? I'd say user-callable/-visible functions should have that rather than the "hidden" __<somefunc>__ functions.

Philip Nienhuis <philipnienhuis>
Project Member
Sun 15 May 2022 07:39:39 PM UTC, comment #2: 

Interestingly, Octave already had input validation to detect this case and emit a useful warning.  But, there were no BIST input validation tests and at some point in time a conditional was changed from "||" to "&&" and this was disabled.  I will write something about this on Octave Discourse.

I fixed the issue on the stable branch since this a regression.  See http://hg.savannah.gnu.org/hgweb/octave/rev/f69dbed63186.

Marking as Fixed and closing report.

Rik <rik5>
Project Administrator
Sun 15 May 2022 04:19:02 PM UTC, comment #1: 

Yeah, there should be some input validation in -I suppose- xlim.m itself. None of that there at all.

Philip Nienhuis <philipnienhuis>
Project Member
Fri 13 May 2022 09:51:52 AM UTC, original submission:  

The following code


gives an irritating error message under Octave (7.1):

error: arg(1): out of bound 0 (dimensions are 0x0) (note: variable 'arg' shadows function)
error: called from
    __axis_limits__ at line 54 column 22
    xlim at line 60 column 7

In Matlab this code also throws an error message, but it's much easier to understand:

Error using xlim (line 31)
Limits must be a 2-element vector of increasing numeric values.

Could we improve our error message in xlim, in order to not confuse users in this case?

Hartmut <hardy>


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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-05-15 rik5 Item GroupUnexpected Error or Warning => Regression
        StatusConfirmed => Fixed
        Open/ClosedOpen => Closed
    2022-05-15 philipnienhuis StatusNone => Confirmed

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