[Octave-bug-tracker] [bug #49190] no return to prompt by ode45() when blowup of solution occurs

[Andreas Stahel]

URL:
  <http://savannah.gnu.org/bugs/?49190>

                 Summary: no return to prompt by ode45() when blowup of
solution occurs
                 Project: GNU Octave
            Submitted by: sha1
            Submitted on: Mon 26 Sep 2016 01:58:22 PM CEST
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.0-rc2
        Operating System: GNU/Linux

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Details:

Dear developers

when calling
[t,x]=ode45(@(t,x)1+x.^2,[0,2],0)
Octave does not return to prompt at all
while 
[t,x]=ode45(@(t,x)1+x.^2,[0,1],0)
leads to a correct result
The exact solution of the ODE is x(t) = tan(t)
Thus the failing situation is running into a blowup of the solution.

The "old" package odepkg solves the problem with an appropriate warning
message.




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