input lambda x, y but get error

[Acpear]

#1537 Hi! Can someone tell me a way to solve the following question?
There is my error code:

class VF(Scene):
def construct(self):
plane = NumberPlane()
vector_field = VectorField(
lambda x, y: np.dot([3 * x, 2 * y])
)
self.add(plane, vector_field)
self.wait()

I run it but only to find that CMD feedbacked me with " () missing 1 required positional argument: 'y' "
I am confused and looking forward to your reply, thanks!

[TonyCrane]

I think you want to write lambda x, y: np.array([3 * x, 2 * y]).
np.dot is the dot product operator of the matrix.

[Acpear]

谢谢XG大佬，我试了下，还是提醒这一句该怎么办

[TonyCrane]

Maybe you lost the second argument plane in VectorField. Take a closer look at those examples