If you have a vector field in MATLAB, you can easily plot the level curves via `contour` and the vector field via `quiver`.
But in mupad, the command to plot the vector field is plot::VectorField2d http://www.mathworks.com/help/toolbox/mupad/plot/PRIMITIV_VectorField2d.html, but I cannot find any way to plot the contour lines of a vector-valued function in mupad
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