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need 2nd order Runge-Kutta (rkfixed) Help

NewUser1-disabl
1-Newbie

need 2nd order Runge-Kutta (rkfixed) Help

Here is the way I set up the problem. When I solve it all I get is "0". I think the problem is in F(x). If anyone can fix this for me it will be greatly appreciated.
2 REPLIES 2

Hi!
At first you must have F(t) not F(x)
Second - I do not understand what function you want to have - can you send a graph.
Valery Ochkov
http://twt.mpei.ac.ru/ochkov

The function is a force function with respect to time. The slope of the line is 4t until time is o.5 seconds and then -4t from 0.5 seconds till time = 1 second. From then on the force function is "0".
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