222

89-1.py

@@ -43,7 +43,7 @@ def SovleRowMain(A,b):
     return b
 
 
-
+# 最小二乘法拟合
 def LeastSquares(list_x,list_y,n):
     m = len(list_x)
     x_n = []
@@ -63,6 +63,7 @@ def LeastSquares(list_x,list_y,n):
         A.append(tmp)
     return SovleRowMain(A,b)
 
+# 计算多项式在给定x值上的值
 def CalculateY(list_x, coeff):
     re = []
     for i in range(len(list_x)):
@@ -71,6 +72,7 @@ def CalculateY(list_x, coeff):
             re[i] += coeff[j]*list_x[i]**j
     return re
 
+# 计算均方根误差
 def MeanSquareErr(list_y,list_y_approx):
     m = len(list_y)
     err = 0
@@ -78,6 +80,7 @@ def MeanSquareErr(list_y,list_y_approx):
         err += (list_y[i] - list_y_approx[i])**2
     return err**0.5
 
+# 计算最大误差
 def MaxErr(list_y,list_y_approx):
     m = len(list_y)
     err = 0
@@ -86,6 +89,7 @@ def MaxErr(list_y,list_y_approx):
             err = abs(list_y[i] - list_y_approx[i])
     return err
 
+# 打印拟合方程
 def PrintEquation(coeff):
     n = len(coeff)
     str_ = str(coeff[0]) + "+"