Собственное 2D-перекрестное произведение ⇐ C++

[Anonymous]

Can Eigen do a 2D cross product?

I was trying to replace this code:

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Eigen::Vector2f a, b;
float result = a.x()*b.y() - b.x()*a.y();

With this:

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Eigen::Vector2f a, b;
float result = a.cross(b);

However, this gives me the following error:

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error C2338: THIS_METHOD_IS_ONLY_FOR_VECTORS_OF_A_SPECIFIC_SIZE

Update

Of course Avi Ginsburg is right and its not really defined. So to clarify: What I'm looking for is the length of the cross product (basically the sine of the angle between the vectors, if I understand it correctly).


Источник: https://stackoverflow.com/questions/330 ... ss-product