Python的ggplot不繪製數據幀

Question

我想繪製下面的數據框。 X和Y是列表。在我準備這些列表之後，我通過字典構造數據框。但是當我把它繪製出來時，並不是真正的情節。

df = pd.DataFrame({"day": day, "ndcg@k": x, "MAP@k": y}) 
df2 = pd.melt(df[['day', 'ndcg@k', 'MAP@k']], id_vars=['day']) 
ggplot(aes(x='day', y='value', group='variable', shape='variable', colour='variable'), data=df2) + geom_line() + geom_point() 

我的數據是這樣的（包括熔體之前和之後的熔體）

 MAP@k  day ndcg@k 
0 0.201919 20150203 0.245559 
1 0.198214 20150204 0.241085 

     day variable  value 
0 20150203 ndcg@k 0.245559 
1 20150204 ndcg@k 0.241085 
2 20150203 MAP@k 0.201919 
3 20150204 MAP@k 0.198214 

Answer 1

這是爲我工作。嘗試以下

import pandas as pd 
from ggplot import * 

df = pd.DataFrame([{"day": 20150203, "ndcg@k": 0.245559, "MAP@k": 0.201919}, 
        {"day": 20150204, "ndcg@k": 0.255559, "MAP@k": 0.191919}, 
        {"day": 20150205, "ndcg@k": 0.2645559, "MAP@k": 0.181919}, 
        {"day": 20150203, "ndcg@k": 0.275559, "MAP@k": 0.171919}, 
        {"day": 20150204, "ndcg@k": 0.285559, "MAP@k": 0.161919}, 
        {"day": 20150205, "ndcg@k": 0.295559, "MAP@k": 0.151919}]) 

df2 = pd.melt(df[['day', 'ndcg@k', 'MAP@k']], id_vars=['day']) 
df2.day = pd.to_datetime(df2.day, format = '%Y%m%d') 
ggplot(aes(x='day', y='value', group='variable', shape='variable', colour='variable'), data=df2) + geom_line() + geom_point() + scale_x_date(labels = date_format('%Y-%m-%d %H:%M'))