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Homework Help: Help in solving a system of ODEs using MATLAB

  1. Feb 24, 2009 #1
    Hello, I have been trying to solve this problem and the only thing I got is errors and errors. Also I need to plot y versus t, y' versus t and y' versus y??

    1. The problem statement, all variables and given/known data

    The system of ODEs

    y1'= y2
    y2'= -2y1-0.03y13

    The time span is [0:0.1:5]
    and there are no initial conditions!

    Need to be solved using ODE45 solver

    2. Relevant equations


    3. The attempt at a solution

    I created this m-file

    function yprime = syst1(t, y)
    yprime = [y(2); -2*y(1)-0.03*(y(1))^3];

    then in the command window

    [t y]=oder45 ('syst1', tspan)

    and then nothing comes out. I have found many examples of solving systems of ODEs but all of them with initial conditions which is not my case. Can someone explain me waht I am doing wrong?

    Than You
  2. jcsd
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