nonlinear differential equation system
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I m trying to solve a nonlinear differential equation could you please help me
x1'=x1+2x1*x2-x1x3 x2'=-3x1+x2+x1*x3 x3'=x2*x3-3*x3
this system has initial conditons
回答（1 个）
Babak
2012-9-27
0 个投票
If you are trying to solve it numerically with some numbers as initial conditions, you can use MATLAB's built in ODE solvers like ODE45,...
YOu only need to out your equations in the required format.
6 个评论
pooria par
2012-9-27
Babak
2012-9-27
Differential equations ALWAYS have to come with initial conditions! You can either have numerical initial conditions like x1(0)=3, x2(0)=-4, x4(0)=2 or not. In the latter case, the differential equation has to be integrated symbolically for x1(0)=x10, x2(0)=x20, x4(0)=x40. In this case you are looking for an analytical solution to your differential equation.
pooria par
2012-9-27
Star Strider
2012-9-27
Yes, but unfortunately not yours. I already tried to solve your system with the Symbolic Math Toolbox.
Cyrus Azizzadeh
2022-1-5
can I solve systems like this in matlab?
dy(1) = 3*y(1) *t.^3 + y(2) + sin(dy(2)) + tan(dy(1)) ;
dy(2) = y(2) - y(1) + y(2).^4 + y(2).^4 + 3*t*dy(1) ;
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2012-9-27
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