[Octave-bug-tracker] [bug #29577] 'sqp' function returns an error-code which is not contemplated in the documentation

[Guido Walter Pettinari]

URL:
  <http://savannah.gnu.org/bugs/?29577>

                 Summary: 'sqp' function returns an error-code which is not
contemplated in the documentation
                 Project: GNU Octave
            Submitted by: coccoinomane
            Submitted on: Fri 16 Apr 2010 04:56:10 PM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: Documentation
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: Mac OS

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Details:

Hello world!

In my current project I extensively use the minimization function 'sqp',
which is a wrapper to 'qp'. This function returns the error state of the
minimizer in the output variable 'info'. According to the documentation, the
possible values of 'info' are 101 (success), 102 (failure) and 103 (exceeded
number of iterations).

However, I often get 'info = 0'. I checked the file 'sqp.m' and I found out
that this is basically a sign of success (0 is the return value of 'qp' on
success). 'sqp' simply misses a line to translate the info state from qp's
zero to 101. I believe that the fix would be simply to include the line:
"""
info = 101
"""
just before the break statement in:
""""
if (t2 && t3 && max ([t0; t1; t4]) < tol)
break;
endif
"""

Cheers,

Guido




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