html 与wordpress/重庆seo霸屏

我现在做一个线性回归分析。输入变量是Size。产出变量是价格。我将数据集存储在2D数组中。教授们告诉我，使用MPY进行循环分析很容易。

Formula of interation is shown as the picture in the hyperlink。因此，我决定使用以下代码进行计算：#Structure of array (Stored in float), with structure like this [Room, Price]

array = [[4.0, 399.9], [5.0, 329.9], [6.0, 369.0]]

#Set initial value

theta_price = 0

theta_room = 0

stepsize = 0.01

item = 3

#Perform iterations

for looping in range(0, 50): #Loop 50 times

for j in array[0]: #Call the value stored in array[0]

for k in array[1]: #Call the value stored in array[1]

theta_price_1 = theta_price - stepsize * (1 / item) * (sum((theta_price + theta_room * int(j) - int(k)))#Perform iterations of theta 0

theta_room_1 = theta_room - stepsize * (1 / item) * (sum((theta_price + t + theta_room * int(j) - int(k))*int(j)))#Perform iterations of theta 1

#Bring the new theta value to the next loop

theta_price = theta_price_1

theta_room = theta_room_1

print(theta_price,theta_room)#Print the result for every loop

上述代码不起作用，第10行出现错误消息：

^{pr2}$

但是如果我去掉求和函数，它的计算结果是不正确的。因此，我知道它和函数和数组有一些问题，但我不知道如何解决它？在