列出实验数据
point=[[2,3,48],[4,5,50],[5,7,51],[8,9,55],[9,12,56]]
plt.xlabel("X1")
plt.ylabel("X2")
#表示矩阵中的值...X2Sum = 0.0
X1_2Sum = 0.0
X1X2Sum = 0.0
X2_2Sum = 0.0
YSum = 0.0
X1YSum = 0.0
X2YSum = 0.0
#在图中显示各点的位置...YSum = YSum+yi
X1YSum = X1YSum+x1i*yi
X2YSum = X2YSum+x2i*yi
# 进行矩阵运算
# _mat1 设为 mat1 的逆矩阵