function of several variables

基本解释

So, a function of several variables doesn't have the usual derivative.
因此，一個多變量的函數沒有通常的導數。
According to the different signal characteristics, signal or can be expressed as a function of several independent variables .
按信號特點的不同，信號可表示成一個或幾個獨立變量的函數。
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.
類似地，一個多元函數，具躰點，比如二元函數，它的最小值和最大值,可以在臨界點処取到。