How to model a 2 dimensional drone using JUMP, and lpopt

Specific Domains Optimization (Mathematical)
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BoundsError: attempt to access 20-element Vector{JuMP.VariableRef} at index [0]

You have:

@constraint(model, [i=1:num_time_steps, j=[1]], acceleration[j, i] == accel_Thr[i-1]*sin(angle))

Here i=1:num_time_steps, but you’re calling accel_Thr[i-1]. When i=1, this is calling accel_Thr[0], which doesn’t exist.

Perhaps you meant

@constraint(model, [i=2:num_time_steps, j=[1]], acceleration[j, i] == acceleration[j, i-1] + accel_Thr[i-1]*sin(angle[i-1]))

In no case should you use undef inside a JuMP macro.