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May
15
comment Starting NDSolve from intermediate time step?
Ok. Thanks! I actually just learned the use of @!
May
15
accepted Starting NDSolve from intermediate time step?
May
15
comment Starting NDSolve from intermediate time step?
Thanks! Just so that I understand this right sol2 is the solution from t=2 to t=5...?
May
15
comment Starting NDSolve from intermediate time step?
@DanielLichtblau Yes, steady state.
May
14
asked Starting NDSolve from intermediate time step?
Apr
6
comment Setting the DifferenceOrder Option
Aah! I see that! Thanks!
Apr
5
comment Setting the DifferenceOrder Option
@rcoyller Well, when I solve the example differential equation that you have and load the InterpolatingFunctionAnatomy package and ask for the order via sol["InterpolationOrder"], it DOES NOT give me the order... it just pops out {{y->InterpolatingFunction[{{0.,6.28319}},<>]}}[InterpolationOrder]
Apr
5
comment Setting the DifferenceOrder Option
I am all ears!!!!!!
Apr
4
comment Setting the DifferenceOrder Option
Thanks! I was thinking about InterpolatingFunctionAnatomy
Apr
3
comment Getting Integrate to perform numerical integration
@F'x Oh, just curious!
Apr
2
comment Getting Integrate to perform numerical integration
So did you use Timing or AbsoluteTiming to figure out how long it took for the code to run?
Apr
2
comment Controlling the time step in NDSolve?
@AlbertRetey Do you think there is a way to see what the Jacobian looks like though?
Apr
1
comment Controlling the time step in NDSolve?
@AlbertRetey sure thing man! No beef! :P It would be great to figure a way out to actually meddle with the internals of mathematica like one can do with say ode15 in MATLAB! Thanks for helping!
Mar
30
comment Controlling the time step in NDSolve?
@AlbertRetey sure. I understand that. But even adaptive time step methods are predicated on some condition. How do I control that condition? I am guessing in this case, its a stiffness-stability criterion that decides the time step. Is there some way I can look at the Jacobian matrix from NDSolve[...]? Anyone?
Mar
30
asked Controlling the time step in NDSolve?
Mar
29
revised Setting the DifferenceOrder Option
Completing remarks provided.
Mar
29
comment Setting the DifferenceOrder Option
In the name of completion and all that, I was able to reproduce results in this paper by increasing the "MaxStepFraction" to 150. That generated a grid of 151x151 which seemed well and good for the nonlinear partial differential equation as described in the paper..
Mar
28
comment NIntegrate is resetting my variables and not giving me a result?
@SjoerdC.deVries Hmm thats all food for thought. I'll carefully read my code and try to understand your constructive comments in that perspective.
Mar
28
comment NIntegrate is resetting my variables and not giving me a result?
This is the answer. However, I couldn't ever have known of the _?NumericQ thingy! I'll have to look it up. Aah, the trials and tribulations of being a paper and pencil engineer!
Mar
28
accepted NIntegrate is resetting my variables and not giving me a result?