bugGNU Octave - Bugs: bug #29637, hess returns wrong result

 
 

bug #29637: hess returns wrong result

Submitter:  Stephen Montgomery-Smith <stephenms>
Submitted:  Thu 22 Apr 2010 01:56:05 AM UTC
   
 
Category:  None Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Fixed Assigned to:  None
Originator Name:  Stephen Montgomery-Smith Open/Closed:  * Closed
Release:  * 3.2.4 Operating System:  * BSD
Fixed Release:  None Planned Release:  None
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Thu 22 Apr 2010 08:40:06 PM UTC, comment #1: 

Fixed and checked in as revision 8db807a0eb78 in the Mercurial source tree.

Thanks for catching this.

Rik <rik5>
Group administrator
Thu 22 Apr 2010 01:56:05 AM UTC, original submission:  

If A is a square matrix, hess(A) returns the wrong result.  According to "help hess" it should return the matrix converted to upper Hessenberg form.  But actually it returns the orthogonal matrix used to transform to upper Hessenberg form.

For example:
A=rand(3)
hess(A)

gives P when it should give H.  The command "[P H]=hess(A)" does work fine.

This should be really easy for you guys to fix.

Stephen Montgomery-Smith <stephenms>

 

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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2010-04-22 rik5 StatusNone Fixed
        Open/ClosedOpen Closed

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