After the formula of documents are used to rewrite elements of Jacobian matrix, the vector cross product is changed into the vector dot product in Jacobian matrix.
利用现有的公式对雅可比矩阵中的元素进行改写，将矢量叉乘变为矢量点乘。
OK, now, so there's an interesting thing to note, which is that we can use the usual product rule for derivatives with vector expressions, with dot products or cross products.
还有个很有趣的现象要注意一下，就是我们可以用乘积法则,对向量表达式求导，无论是点乘或叉乘。
Another way to do it, of course, would provide actually parametric equations of these lines, get vectors along them and then take the cross-product to get the normal vector to the plane.
当然也有另一种方法，就是用参数方程表示这两条直线，用两条直线的方向向量作外积，从而得到切平面的法向量。
We have the cross-product of the position vector to this point times the force.
我们用这个点的，位置向量，乘以这个力。
To find the surface element together with a normal vector, I would just take the cross-product between these guys.
为了找到带法向量的面元，我就取这两个的叉积。
I put a vector sign over here, because you have to take the cross-product between the two, so you take the... sine of this Angle has to be taken into account.
在此加一个向量标志，因为必须要，算这俩的乘积，所以，sin这个角度必须，考虑在内。
The inner product algorithm and cross multiply algorithm in the vector calculation are used to deduce active power and reactive power.
利用矢量运算中的内积算法和叉乘算法来推导有功功率和无功功率。
The inner product algorithm and cross multiply algorithm in the vector calculation are used to deduce active power and reactive power.
利用矢量运算中的内积算法和叉乘算法来推导有功功率和无功功率。
应用推荐