bugGNU Octave - Bugs: bug #41818, Fixed up "find" function...


bug #41818: Fixed up "find" function with templates and fourth parameter

Submitted by:  David Spies <dspyz>
Submitted on:  Mon 10 Mar 2014 12:07:40 AM UTC  
Category:  Octave Function Severity:  3 - Normal
Priority:  3 - Low Item Group:  Feature Request
Status:  Patch Submitted Assigned to:  None
Originator Name:  Open/Closed:  Open
Release:  dev Operating System:  Any

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Mon 08 Feb 2016 02:06:56 PM UTC, comment #2: 

David, do you plan to respond to Rik's request?

Also, what is the main benefit of your patch?  Is it smaller code, faster execution, easier maintenance or just the elegance of having a common template?

You note that min() isn't in the code; the code uses std::min in some places.

It would be nice for each function or template to have a brief comment explaining why it exists.  Most are so simple that the reader can see what and how, but it is useful to describe why -- what does the function enable?

Lachlan Andrew <lachlan>
Thu 13 Mar 2014 10:51:13 PM UTC, comment #1: 

Have you looked at the Matlab find function (http://www.mathworks.com/help/matlab/ref/find.html)?  There is no 4th argument and Octave is extremely unlikely to break compatibility with such a core function.

I think it would be better to submit a changeset for just the template changes.

Rik <rik5>
Project Administrator
Mon 10 Mar 2014 12:07:40 AM UTC, original submission:  

I cleaned up the "find" function adding templates to channel all calls to 'find' for all types into the same template function.

As a side-effect, this fixes the following matlab/full-matrix incompatibility:
octave:3> a = sparse(0,0);
octave:4> size(find(a))
ans =

   0   1

(Matlab and full matrices give 0 0)

Additionally I added a fourth parameter to specify the desired dimension of the output vectors:
octave:3> a = eye(3);
octave:4> [i,j,v] = find(a,Inf,"first",2)
i =

   1   2   3

j =

   1   2   3

v =

   1   1   1

Could someone please look over my changes?


David Spies <dspyz>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

Attached Files
file #30838:  find4.diff added by dspyz (23KiB - text/x-patch)


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2016-03-22 lachlan Priority5 - Normal => 3 - Low
        StatusNone => Patch Submitted
    2014-03-10 dspyz Attached File- => Added find4.diff, #30838

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