Hi guys,

i solve the equations of motion for a triple pendulum(Eq17,Eq27,Eq28). After that, I applied numerical values and initial conditions to solve these equations numerically. But unfortunatially i get the following error.

> g := 9, 81; l[1] := 5; l[2] := 3; l[3] := 1; m[1] := 5; m[2] := 3; m[3] := 1;
> ini := `ϕ`[1](0) = (1/3)*Pi, (D(`ϕ`[1]))(0) = 0, `ϕ`[2](0) = (2/3)*Pi, (D(`ϕ`[2]))(0) = 0, `ϕ`[3...