MATLAB: 4th order non linear differential equation

4th order non linear differential equation

can any body help me with the matlab code

of this 4th order non linear differential equation

Best Answer

‘I want to plot ode and not the sum of D ,D2f,D3f, D4f I want to plot the ode as one solution’

Then try this (using my previous Answer):

[X,Y] = ode45(odefcn, [0 1], [0 1 -8 6]);
figure
plot(X, Y(:,1))
grid

That will plot only ‘f’.

Related Solutions

MATLAB: Solving a non linear ODE with Matlab ode functions

Try using 'ode15i' which can use implicit differential equations. In your example you would presumably have the two components in your function handle:

 (y'(2))^2*t^2+2*y(1)*y'(2)+(y(2))^2 = 0
 y'(1)-y(2) = 0

MATLAB: 4th degree question ploting

Try this:

Ctg =[0.322; 0.122; 0.084; 0.053; 0.031; 0.01];
t =[0; 20; 40; 60; 80; 100];
plot(t, Ctg, 'ko', 'LineWidth', 2, 'MarkerSize', 15);
hold on;
% Estimate the coefficients for a 4th order polynomial.
coefficients = polyfit(t, Ctg, 4)
% Make a new x
t = linspace(min(t), max(t), 1000);
% 4th degree Equation
R = coefficients(1)*t.^4 + coefficients(2)*t.^3 + coefficients(3)*t.^2 + coefficients(4)*t+ coefficients(5);
plot(t, R, 'b-', 'LineWidth', 2);
grid on;

Best Answer

Related Solutions

MATLAB: Solving a non linear ODE with Matlab ode functions

MATLAB: 4th degree question ploting

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