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[Octave-bug-tracker] [bug #49950] ode scripts: error on NormControl


From: Chiara Segala
Subject: [Octave-bug-tracker] [bug #49950] ode scripts: error on NormControl
Date: Thu, 29 Dec 2016 16:05:01 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:50.0) Gecko/20100101 Firefox/50.0

URL:
  <http://savannah.gnu.org/bugs/?49950>

                 Summary: ode scripts: error on NormControl
                 Project: GNU Octave
            Submitted by: chiarasegala
            Submitted on: Thu 29 Dec 2016 04:05:00 PM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Documentation
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.0
        Operating System: GNU/Linux

    _______________________________________________________

Details:

The help of odeset.m says
"NormControl
Control error relative to the 2-norm of the solution, rather than its
absolute value."
But then does the opposite.
In integrate_adaptive.m:

dt = starting_stepsize (order, func, t, x,
                            options.AbsTol, options.RelTol,
                            strcmp (options.NormControl, "on"),
                            options.funarguments);

in AbsRel_norm.m:

  if (normcontrol)
    retval = max (abs (x - y) ./ sc);
  else
    retval = sqrt ((1 / n) * sumsq ((x - y) ./ sc));
  endif

It needs to flip the previous "if".




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  <http://savannah.gnu.org/bugs/?49950>

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