数值逼近是数值分析的深化课程，是函数逼近理论（应用数学分支）的应用，在计算数学中有着重要的地位，对于信号的仿真有重要帮助。(Numerical approximation is a deepening course of numerical analysis. It is the application of function approximation theory (applied mathematics branch). It plays an important role in computational mathematics, and is helpful for signal simulation.)