堆积直方图在熊猫中不起作用

Question

我正在玩熊猫并拥有以下代码：

  

tips.hist（stacked = True，column =“total_bill”，by =“time”）

结果图看起来不错：

然而，它没有堆叠！我想把它们都放在一块地上，堆叠在一起。我希望它看起来像文档中的那个：http://pandas.pydata.org/pandas-docs/stable/visualization.html#histograms

非常感谢任何帮助。

Answer 1

您需要单独列中的值。

  case class Ids(Ids: Seq[String])

  case class Id(Id: String)

  case class Name(Name: String)

  case class OnHand(OnHand: Int)

  case class LoyaltyId(LoyaltyId: Int)

  case class ProductPrice(RetailPrice: Double, 
   RetailPriceSymbol: String,
    PromotionPrice: Double,
    PromotionPriceSymbol: String)

  case class Product(Name: String, 
                    ProductCategory: String, 
                    InventoryTrackingNumberType: String,
                    InventoryTrackingNumber: String, 
                    ProductPrice: ProductPrice)

  object MyJsonProtocol2 extends DefaultJsonProtocol {
    implicit val nameFormat = jsonFormat1(Name)
    implicit val productPriceFormat = jsonFormat4(ProductPrice)
    implicit val productFormat = jsonFormat5(Product)
    implicit val loyaltyIdFormat = jsonFormat1(LoyaltyId)
    implicit val onHandFormat = jsonFormat1(OnHand)
    implicit val idFormat = jsonFormat1(Id)
    implicit val idsFormat = jsonFormat1(Ids)
    implicit val dateFormat = jsonFormat20(Data)
    implicit val claXFormat2 = jsonFormat8(claX2)
  }

tips = pd.read_csv('https://raw.github.com/pydata/pandas/master/pandas/tests/data/tips.csv')
>>> tips[['time', 'tip']].pivot(columns='time').plot(kind='hist', stacked=True)