Solving Nonlinear Equations in MATLAB: Troubleshooting with fsolve Command

  • Context: MATLAB 
  • Thread starter Thread starter fluidman
  • Start date Start date
  • Tags Tags
    Matlab
Click For Summary
SUMMARY

The forum discussion addresses troubleshooting the fsolve command in MATLAB for solving a system of nonlinear equations. The user encountered an error indicating that the maximum number of function evaluations was reached, suggesting that the function did not converge within the allowed iterations. The solution involves increasing the options.MaxFunEvals parameter in the fsolve function to allow more evaluations and improve convergence. This adjustment is critical for successfully solving nonlinear equations using MATLAB's fsolve.

PREREQUISITES
  • Familiarity with MATLAB programming environment
  • Understanding of nonlinear equations and their solutions
  • Knowledge of MATLAB's fsolve function and its parameters
  • Basic experience with MATLAB m-files for function definitions
NEXT STEPS
  • Learn how to adjust options in MATLAB's fsolve function
  • Explore MATLAB documentation on function convergence and error handling
  • Investigate alternative methods for solving nonlinear equations in MATLAB
  • Study the impact of initial guesses on the performance of fsolve
USEFUL FOR

Mathematics students, engineers, and researchers who are working with nonlinear equations in MATLAB and need to troubleshoot convergence issues with the fsolve command.

fluidman
Messages
3
Reaction score
0
Hi to everyone.I were to solve a nonlinear equations system consisting of two unknown parameters and two equations.I have written a Matlab m-file to define the functions in order to solve them by embeded fsolve Matlab command.But I end up with an error occurring on the command window, when i attempt to solve the equations by typing
>> x0=[0.0157;0.01585];
>> [x, functionvalue, control, feature]=fsolve('saumrd',x0);
where saumrd is the name of the m-file in which I defined the functions.The error occurred after typing the above script on command window is as follows:

Maximum number of function evaluations reached:
increase options.MaxFunEvals.

Is ther anyone who will comment on the error and guide me to overcome this proplem?Thanking you so much.
 
Physics news on Phys.org
Look at your documentation, you're not converging to an answer within the number of maximum iterations allowed by fsolve. Look in the fsolve.m file and increase options.MaxFunEvals.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
Replies
1
Views
7K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K