求XY关系的函数

或者是傅里叶级数展开，含义差不多，呵呵

liumingmingabc 发表于 2023-6-21 16:47
或者是傅里叶级数展开，含义差不多，呵呵

算了，没人接任务，这最优答案给你吧

分段拟合，后面那些还是数据太少。
0<x<=0.1   ,y = -2.889170809523780E+01x3 - 1.145646389006290E+00x2 + 5.024538097104140E+00x
0.1<x<=0.2   ,y = 9.906759906618390E+00x3 - 1.363053613048540E+01x2 + 6.394638694632530E+00x - 5.095337995319850E-02

0.2<x<=0.6   ,y = 6.518518602848050E+01x6 - 1.472136778354640E+02x5 + 1.232877520978450E+02x4 - 3.987234023571010E+01x3 - 2.973894400395450E+00x2 + 5.150955153020820E+00x + 1.541617168158160E-02

就用excel画出散点图，画出趋势线，显示公式，注意公式的有效数字要多