kirill_igum
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 Mar 26 awarded Popular Question Nov 20 revised Coulomb/kepler potential dynamics. NDSolve breaks added 869 characters in body Nov 19 comment Coulomb/kepler potential dynamics. NDSolve breaks @chris I'm still new to mathematica. i looked at the examples, they involve a bit more writing. the second one is planar coordinates. However, looking at the first one, writing eqs in terms of vector (eqs = {{Derivative[1][q][T] == p[T], Derivative[1][p][T] == -q[T]/( 4 Pi Norm[q[T]]^3)}, {q[0] == {1, 0, 0}, p[0] == {0, 0.5, 0}}};)should've given a result but I still run into problems. again, i'm new so some things are confusing. Nov 19 comment Coulomb/kepler potential dynamics. NDSolve breaks @NasserM.Abbasi I updated the question, I couldn't find the link to the correct solution but total energy has to be conserved. Nov 19 revised Coulomb/kepler potential dynamics. NDSolve breaks added 227 characters in body Nov 19 revised Coulomb/kepler potential dynamics. NDSolve breaks added 179 characters in body Nov 19 comment Coulomb/kepler potential dynamics. NDSolve breaks @SjoerdC.deVries at the time just before 20, the second curve starts jumping. if you increase time (for example to 200), the motion doesn't look like an orbit. Nov 19 comment Coulomb/kepler potential dynamics. NDSolve breaks @chris what do you mean by softening the force? Nov 19 asked Coulomb/kepler potential dynamics. NDSolve breaks Nov 4 comment Implementing efficient multiple undo would be nice to have an undo tree like in vim Apr 27 awarded Scholar Apr 27 accepted print the name of the variable in a list without evaluation Apr 27 comment print the name of the variable in a list without evaluation this one is a little hard to understand. can you add more info? # is the argument of a pure function, <> is string joint. What does &@ mean?I can see it starts the pure function. Apr 27 awarded Student Apr 27 awarded Editor Apr 27 revised print the name of the variable in a list without evaluation added 356 characters in body Apr 27 asked print the name of the variable in a list without evaluation Mar 11 awarded Supporter