- Do you have the code that you've already tried?
- Have you tried any different options for the solvers?
- What are sensible initial conditions?
- Are there any hard constraints on the variables?
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Solving System of Non Linear algebraic equations
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I need help in solving following equations: I tried different solvers like fsolve, lsqnonlin but the solution is not converging. Please note that x(1), x(2), x(3) are extent of reactions of a system.
((6.2975e-11)*((1-x(1)-x(2)-x(3))*((0-3.*x(1)-7.*x(2))^3)*((1+0+8*x(1)+8*x(2)+4*x(3))^8))) - (((4.*x(1)+x(3))^4)*((8.*x(1)+12.*x(2)+x(3))^8));
(0.0184*((1-x(1)-x(2)-x(3))*((0-3.*x(1)-7.*x(2))^7)*((1+0+8*x(1)+8*x(2)+4*x(3))^8))) - (((4*x(2))^4)*((8.*x(1)+12.*x(2)+x(3))^12));
((4.3202e+16)*((1-x(1)-x(2)-x(3))*((1+0+8*x(1)+8*x(2)+4*x(3))^4))) - (((4.*x(1)+x(3)))*((2.*x(3))^2)*(8.*x(1)+12.*x(2)+x(3))*(x(3)));
2 个评论
Martin Brown
2015-6-23
编辑:Martin Brown
2015-6-23
Hi, It may help if ...
Thanks. Note some of terms are large (e+16 and ^8) and others are small (e-11) so scaling could easily be a problem.
Walter Roberson
2015-6-23
If the values represent concentrations then are they in the range 0 to 1? Everything is real-valued?
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