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Re: problem with finding equilibrium points of nonlinear system
Posted:
Mar 8, 2013 3:06 PM


On 3/8/2013 1:56 PM, gilraen wrote: > Hi all, > > I need to find equilibrium points of nonlinear system which consist of 9 equations. >It is complicated system, so when I tried find equilibrium points in this way: > > syms x1 x2 > solve(x*2+3,x2^32, x32*x2); (it is just example) > > it give warning: > > Warning: The solutions are parametrized by the symbols > > It means it cannot be solve analytically. I try to solve this problem numerically but I am stuck. > > Is there any method how can I find equillibrium points in matlab numerically? > > Any help will be appreciated. >
You should post complete example, and not bits and pieces. The above could not have worked as x is not defined, and x3 is not defined.
But it works for me:
 syms x1 x2 x x3 sol=solve(x*2+3,x2^32, x32*x2);
EDU>> sol.x 3/2 3/2 3/2 EDU>> sol.x2 16^(1/3)/2 (3^(1/2)*16^(1/3)*i)/4  16^(1/3)/4  (3^(1/2)*16^(1/3)*i)/4  16^(1/3)/4 EDU>> sol.x3 16^(1/3) (3^(1/2)*16^(1/3)*i)/2  16^(1/3)/2  (3^(1/2)*16^(1/3)*i)/2  16^(1/3)/2 
Nasser



