Many students ask me how do I do this or that in MATLAB. So I thought why not have a small series of my next few blogs do that. In this blog, I show you how to solve a nonlinear equation.
The MATLAB program link is here.
The HTML version of the MATLAB program is here.
%% HOW DO I DO THAT IN MATLAB SERIES?
% In this series, I am answering questions that students have asked
% me about MATLAB. Most of the questions relate to a mathematical
% How do I solve a nonlinear equation?
% Language : Matlab 2008a;
% Authors : Autar Kaw;
% Mfile available at
% Last Revised : March 28, 2009;
% Abstract: This program shows you how to solve a nonlinear equation.
disp(‘ This program shows you how to solve’)
disp(‘ a nonlinear equation’)
disp(‘ Autar K Kaw of https://autarkaw.wordpress.com’)
disp(‘ April 11, 2009’)
% Solve the nonlinear equation x^3-15*x^2+47*x-33=0
% Define x as a symbol
% Assigning the fleft hand side o the equation f(x)=0
%% DISPLAYING INPUTS
func=[‘ The equation to be solved is ‘ char(f), ‘=0’];
%% THE CODE
% Finding the solution of the nonlinear equation
%% DISPLAYING OUTPUTS
fprintf(‘\nThe solution# %g is %g’,i,solnvalue(i))
This post is brought to you by Holistic Numerical Methods: Numerical Methods for the STEM undergraduate at http://numericalmethods.eng.usf.edu, the textbook on Numerical Methods with Applications available from the lulu storefront, and the YouTube video lectures available at http://numericalmethods.eng.usf.edu/videos and http://www.youtube.com/numericalmethodsguy
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19 thoughts on “How do I solve a nonlinear equation in MATLAB?”
Nice …. and thnx….
Can u please tell me how i can solve a nonlinear equation with a set of constraints in matlab….
Can you help me to solve this equation?
Use finite difference method.
Use the backward divided approximation for the dh/dx condition
i need help with solving nonlinear system of three equations that repeated over 30000000
nodes see the number of nodes a lot and due to saving the function problem i cant use the fsolve please help me
i need to solve system of three equations over a 30000000 node my problem is how to save them to use in fsolve you know the node number
please help me to solve this nonlinear oderinery differntial equation
ydot1 = 20*y(1)*((y(2)-30.6176)/30.6176)-0.03*y(1);
ydot2 = -0.07*y(2)-(28.7776)*((1.4873)^t)*(y(2)^2)/y(1)^0.38-10*y(2)^2*(y(2)-30.6176)^2/30.6176;
and initial conditions are y1(0)=1706115.9
please help me it is very important for me
i used ode45 for solving it but the answer was NaN!!!!!
I have a similar problem, I want to solve a non linear 2nd order system of 3 equations & when i use ode45 the answer is NAN :s. Have you solved yours ??
<a href=" to get detail knowledge about mathlab and soln with their quastions
Thanks man!! That really helped my work.
i want to solve this four equations;
x(3) – ((log(x(1)/ 65792043000 )) -( 0.07+(0.5*(x(2)^2))))/x(2);
x(4) – x(3) + x(2);
8507000337- x(1)*normcdf(x(3)) + 65792043000*exp(-0.07)*normcdf(x(4));
(8507000337* 0.347089018056744) – x(1)*x(2)*normcdf(x(3))];
can u solve?
please help me!!!!
i need a point to solve a nonlinear equation state space in matlab…
[0 1 ] [x1] [0 ]
[x^4 -1] [x2] [sin(t)]
thanks for your guide..