bugGNU Octave - Bugs: bug #53548, area : Octave giving error while...


bug #53548: area : Octave giving error while MATLAB giving warning in complex input.

Submitter:  Dildar Sk <hodor123456>
Submitted:  Mon 02 Apr 2018 05:49:48 PM UTC
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Other
Status:  Wont Fix Assigned to:  None
Originator Name:  Dildar Sk Open/Closed:  * Closed
Release:  * dev Operating System:  * GNU/Linux
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Mon 16 Apr 2018 09:04:19 PM UTC, comment #2: 

I believe it is better to leave this as an error.  Octave, in general, tries to validate its inputs more carefully than Matlab.

In this case, it's not clear what an area plot of a sequence of complex numbers would look like.  It doesn't make much sense, and it probably means the programmer has made an error and it should be reported that way.  If the programmer really wants to see an area plot of just the real part of the data then they can easily do so by adding a call to real() inside the call to area like so

area (real (a))

This is better than Matlab's default assumption that the real data is more valuable than the complex data and should be the part that is plotted.  For example, another perfectly good choice would have been to plot the magnitude of the complex number, rather than just the real part.

Rik <rik5>
Project Administrator
Tue 10 Apr 2018 07:24:13 PM UTC, comment #1: 


I think that this can be solved modifying the input validation. I attach a file which should work.
Moreover, if in Matlab the scalar argument is given complex, it uses the real part without giving any warning (try area (1:5, 1i) ). In the modification I did a warning is given.

(file #43873)

Michele Ginesi <m_ginesi>
Mon 02 Apr 2018 05:49:48 PM UTC, original submission:  


>> a = [1:10] + i;
>> area (a)
Warning: Using only the real component of complex data.
> In getRealData (line 52)
  In area (line 49)

In Octave,

>> a = [1:10] + i;
>> area (a)
error: area: X and Y must be real vectors or matrices
error: called from
    area at line 96 column 5

Dildar Sk <hodor123456>


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Attach Files:

Attached Files
file #43873:  area.diff added by m_ginesi (2KiB - text/x-patch)


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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-04-16 rik5 StatusNone Wont Fix
        Open/ClosedOpen Closed
    2018-04-10 m_ginesi Attached File- Added area.diff, #43873
    2018-04-02 hodor123456 Carbon-Copy- Added -email is unavailable-

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