why do we get different responses when simulating the same ODE model with matlab and simulink, even when using the same initial values and parameters.
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problem with model calibration
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Sara
2014-7-14
Are you using the same ode solver with the same options?
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Hi, Yes, i'm using the same ODE solver "ODE 45", with the same parameters
the system of nonlinear ordinary differential equations is given by the following equations :
Knowing that :
For initial conditions equals respectively to : [1,05 ; 0,001; 2, 0] for t=1 :1 :48 And parameter values equals to : Mu=0,6 ;K=3,6 ;Delta=0,087 ; Sigma=2 ; S-inf=0,35 ; beta=0,22 ; Y=0,63 ;phi=0,146 ; v1,36= . The problem i face is an inconsistence in results given when i model the system using matlab command line, and when modeling it with simulink, the inconsistencies rellies on differences observed when i compare my results with those obtained by the author of the system which are for N given by a sigmoidal curve starting from 0 and reaching a steady state at a value of 1 or a bit more, and from 0 to 2,5 or 3 for P . For S we get a sigmoidal decay curve starting from 2 and finiching at 0 . And finaly, for Q we have a bell curve reaching top at value equal to 0,3 ; 0,4 and decreasing until it reach zero . Thank you for your help.
3 个评论
Sara
2014-7-15
Was the simulink model implemented by someone else? You may want to try to use odeset/odeget to check with tolerance is set in the two systems (simulink vs. command line)
rafik
2014-7-16
Sara
2014-7-16
I don't have the simulink so I can't test it, unfortunately. I would recommend setting the same options in both the simulink and the matlab to be sure that they match first. Can you attach the published results? I could take a look at the command line implementation if that could help.
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