尝试在 jupyter notebook 的 numpy 数组中使用 np.dot 时，矩阵未对齐答案

【问题标题】：matrices are not aligned while trying to use np.dot in numpy arrays in jupyter notebook尝试在 jupyter notebook 的 numpy 数组中使用 np.dot 时，矩阵未对齐
【发布时间】：2021-11-12 10:47:17
【问题描述】：

我正在尝试在 jupyter notebook 中执行以下代码，在此我无法执行两个矩阵的点积

# creating random array
 
np.random.seed(0)
sales_amounts = np.random.randint(20 , size=(5,3))
sales_amounts


# creating weekly sales dataframe

weekly_sales = pd.DataFrame(sales_amounts, index =["Mon","Tues","Wed","Thur","Fri"],
                          columns =["Almond Butter","Peanut Butter","Cashew Butter"])
weekly_sales

# Create the price array
    
    prices = np.array([10,8,12])
    prices

    prices.shape


#Create butter prices dataframe

    butter_prices = pd.DataFrame(prices.reshape(1,3), index=["price"],columns= ["Almond  Butter","Peanut_Butter","Cashew Butter"])
    butter_prices


# shapes not aligned lets transpose

    total_sales = prices.dot(sales_amounts.T)
    total_sales


    #creating daily sales
  
butter_prices.shape,weekly_sales.shape


daily_sales = butter_prices.dot(weekly_sales.T)

在jupyter notebook中执行上述代码后它显示为错误：矩阵未对齐

【问题讨论】：

标签： arrays numpy

【解决方案1】：

解决方案： np.dot(butter_prices, weekly_sales.T) 工作

说明：阅读thread 中的第一个答案，该答案解释了为什么会发生这种情况。

【讨论】：