python - 为什么 matplotlib 上的 Joyplot 代码显示此错误？

Question

我写了一个简单的代码来开始使用 Matplotlib 上的 Joyplots。这是整个代码：

import random
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt import joypy

random.seed(4554)

randomlist = random.sample(range(100,10000),1000) 
randomyear = np.linspace(1018,2018,num=1001)
 
df=pd.DataFrame(list(zip(randomyear,randomlist)),columns=['Year','Values'])

fig, axes = joypy.joyplot(df, by="Year", column="Values",figsize=(5,8))

plt.show()

我不断收到此错误：

ValueError: `dataset` input should have multiple elements.

这是什么意思，我做错了什么，以及如何修复此代码？

Answer 1

您需要每年生成多条记录；您的代码每年生成一条记录。

我已经更新了你的随机数生成：

import random
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt 
import joypy

random.seed(4554)

randomlist = np.random.rand(1000)
randomyear = list(range(1999, 2019)) * 50

df = pd.DataFrame(list(zip(randomyear,randomlist)), columns= ['Year','Values'])

fig, axes = joypy.joyplot(df, by="Year", column="Values",figsize=(5,8))

Answer 2

I got the same error using the following code:

fig, axes = joypy.joyplot(data_sub[["AC","B"]], by="AC", column="B")

ValueError: `dataset` input should have multiple elements.

I checked my dataframe column "AC". This column was supposed to only include values AC1, AC2 and AC3.

But I noticed that I have

• 100 rows of "AC1"
• 103 rows of "AC2"
• 99 rows of "AC3"
• 1 row of "Other" (this should have been AC3)

I replaced "Other" with "AC3" so that no values in the "AC" column of my dataset appears only once. It fixed my problem.