本文介绍了两种基本的向量运算——点乘与叉乘的区别及应用。点乘仅基于角度和距离，没有方向性；而叉乘则可以找到垂直于两向量所定义平面的一个新向量，并给出其长度和方向。
cross product
we know that two vectors can define a plane, the cross plane is to find a vector that perpendicular to this plane which has its own length and direction. And that’s also the difference to dot product.
c=abs(a)*abs(b)*sin(theta)*n
n is a unit vector perpendicular to the plane.
dot product
dot product has no direction, only based on the notions of angle and distance (magnitude of vectors).
defines as c=abs(a)*abs(b)*cos(theta)
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