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Question: dsolve/numeris vars option

Question:dsolve/numeris vars option

ProfJP 5 Maple
dsolve numeric differential-equations
October 25 2017
1

Hi,
Triing to solve some 2 differential equations system (plan mechanical movement), using "output=" as last option, I am interrested by the values of the second derivatives of the coordinates. The "output" runs fine to get t, x(t), y(t), dx/dt(t) and dy/dt(t). To get d^2x/dt^2 and d^2y/dt^2, I thought it would work to write something like (A is the times array) this :

dsol := dsolve(dsys, type = numeric,  {diff(x(t),t,t), diff(y(t),t,t},output = A),

But if I do this, I get next error message :

Error, (in dsolve/numeric/process_input) dependent variables must be functions of a single unknown, the independent variable. Got [diff(diff(x(t), t), t), diff(diff(y(t), t), t)]


Could you please help me ?
Thanks

 
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