Timeline for At t == ..., step size is effectively zero; \ singularity or stiff system suspected
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 26, 2018 at 0:26 | history | edited | Michael E2 | CC BY-SA 3.0 |
Added message name
|
| Mar 25, 2018 at 23:42 | history | edited | John | CC BY-SA 3.0 |
warks to works
|
| Mar 23, 2018 at 20:32 | vote | accept | John | ||
| Mar 22, 2018 at 12:23 | answer | added | Ulrich Neumann | timeline score: 2 | |
| Mar 22, 2018 at 8:31 | comment | added | John | I'm sorry, I used NDsolve and it doesn't work too, than I tried to use Dsolve to see what changes and forgot to change it back | |
| Mar 22, 2018 at 2:15 | comment | added | bbgodfrey |
Yes, DSolve is unable to solve the x1 and x3 ODEs. Incidentally, because the ODEs are autonomous, they can be reduced to first order, although it is unclear whether that would help. Also, I would guess that, if NDSolve eventually is called, it would fail at the turning points of the nonlinear oscillators or when x[t] == 0.
|
|
| Mar 21, 2018 at 23:54 | comment | added | Michael E2 |
@J.M. I think inside ParametricPlot, N[DSolve[..]] is tried, which now calls NDSolve, when DSolve fails.
|
|
| Mar 21, 2018 at 23:53 | comment | added | Michael E2 |
You might try tracking down which command give the error and restrict your code to what is necessary. If DSolve doesn't work, try NDSolve, if a numeric solution would be acceptable. (It seems x1 and x3 fail.)
|
|
| Mar 21, 2018 at 23:52 | comment | added | J. M.'s missing motivation♦ |
Only NDSolve[] and ilk can produce the NDSolve::ndsz error, yet you are using DSolve[] in your code. What am I missing?
|
|
| Mar 21, 2018 at 23:25 | history | asked | John | CC BY-SA 3.0 |