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[Octave-bug-tracker] [bug #49190] no return to prompt by ode45() when bl
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From: |
Andreas Stahel |
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Subject: |
[Octave-bug-tracker] [bug #49190] no return to prompt by ode45() when blowup of solution occurs |
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Date: |
Tue, 27 Sep 2016 08:51:25 +0000 (UTC) |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0 |
Follow-up Comment #4, bug #49190 (project octave):
Hello Carlo
Thank you for the quick fix.
This is Open Source at its best!
The "feature" might not be problem dependent after all.
The exact solutions blow up at different times
x'= 1+x^2 with x(0)=0 solved by x(t) = tan(t), blowup at t=pi/2
x'= 2*(1+x^2) with x(0)=0 solved by x(t) = tan(2*t), blowup at t=pi/4
If the stepsize is made smaller and smaller, (since x(t) is larger and
larger), the solvers will slow down. With a minimal step size, it will stop.
Thank you for the patch
Andreas
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