So, we said when we have a function of two variables, we have the gradient vector.
我们说，当一个二元函数存在时，就有梯度向量。
2
Magnetic vector potential is regarded as variables to gain solution of excitation magnetic field and armature response magnetic field.
以矢量磁位作为求解变量得到励磁磁场和电枢反应磁场的二维解。
3
This paper deals with the multivariate vector analysis of quality data by geometric transformation, rotating coordinates and computation of the principal component of initial variables.