function of several variables

基本解释

So, a function of several variables doesn't have the usual derivative.
因此，一个多变量的函数没有通常的导数。
According to the different signal characteristics, signal or can be expressed as a function of several independent variables .
按信号特点的不同，信号可表示成一个或几个独立变量的函数。
Similarly, when you have a function of several variables, say of two variables, for example, then the minimum and the maximum will be achieved either at a critical point.
类似地，一个多元函数，具体点，比如二元函数，它的最小值和最大值,可以在临界点处取到。