User Portlet User Portlet

Discussions
Hi, I am trying to plot the angles of a spherical pendulum fixed to a oscillating cart. I have derived the equations of motion, when I try to solve the equations using "NDSolve", following error occurs: > `NDSolve::ndsz: At t ==...
Hello, I am trying to plot a double pendulum. But when I try to plot the results, this error occurs: "NDSolve::ndsz: At t == 0.5517583468854775`, step size is effectively zero; singularity or stiff system suspected." Any idea what I've got...
Thank you, I corrected it, but the output says: NDSolve::deqn: Equation or list of equations expected instead of True in the first argument {True,\[Pi],\[Pi],0,0}. NDSolve::deqn: Equation or list of equations expected instead of True in...
Thank you very much, that helped. If I may, I have one more question: When I now want to plot the result, I used: Plot[\[Theta], {t, 0, 10}] Nothing happened. What can be the error?
Thank you very much, the "Remove" Command works very well. Have a nice day.
Thanks for your answer, I reinstalled Mathematica and now it works.