Ode15i problem
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Hi, I am using ode15i to solve some implicit ODEs. I got 7 equations having the form: f(x1,x2,x3,x4,x5,x6,x7,x1',x2',x3',x4',x5',x6',x7')=0 Each of the equation cannot be ignored. Solving this set of equations is easy. But I need to add the following condition into the equations: x7=x3^2-x2*(x4-x2)=0
I have tried taking x3=sqrt(x2*(x4-x2)) into one of the 7 equation, but an error occurred. And the solution of X should not be complex.
Is there another way to add the condition into the ODEs?
Another question is how to use Jacobian in ODESET?
回答（1 个）
Torsten
2018-8-21
Remove the original equation to determine x7 and replace it with the new one:
x7-x3^2+x2*(x4-x2) = 0
Best wishes
Torsten.
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