Solve a second order differential equation

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Mj 2020-11-4

编辑： Mj 2020-11-5

hi.i want to solve this second order differential equation in matlab an plot figure. can you help me please?

d2a/de2=(((((2+c2)./(1+c2)).*(Fu.^2))+1)*(a.^c2)-((2+c2)./(1+c2)).*(Fu.^2./a)-a.^(2+(2.*c2)))./( ((2+c2)/((3+c2).*(1+c2))).*Fu.^2 );

Fu=1

c2=0,0.5,1

Ameer Hamza 2020-11-4

This is a second-order ODE which can be solved using ode45(). See the example titled "Solve Nonstiff Equation" here: https://www.mathworks.com/help/matlab/ref/ode45.html#bu3uj8b

Mj 2020-11-4

i put my initial condition instead of yours, but it did not give me the righ figure.

IC = [0.75; 0];

The alpha value as the initial condition is 0.75. But I do not have d-Alpha in the same place. Elsewhere, d-alpha value is zero.

do you know what should i do?

excuse me because of my boring questions.

Ameer Hamza 2020-11-4

This is the solution according to the equation you shared. Check if there is a mistake in writing the equation.

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