我想在散景線中添加兩個 y 軸值 plot

Question

這行代碼有什么問題..請幫助

import pandas as pd
from bokeh.models import ColumnDataSource
from bokeh.plotting import figure, show, output_file

output_file ('newfile.html')

data = pd.read_excel(r'C:\Users\ASyed\OneDrive -      NKT\PythonProject\bokehPractise\newfile\19AJ100429-GC3-FR-003-A1-KP240.000-KP248.831-SL-AT.xlsx', \
sheet_name= 'Listing')
df = pd.DataFrame(data)
df.columns = [x.replace("\n", " ") for x in df.columns.to_list()]

SOURCE = ColumnDataSource(data = df)
p = figure (plot_width = 800, plot_height = 600)


p.line(x= 'KP [km]', y =[['DOL [m]'], ['DOC [m]']], source = SOURCE )
p.title.text = 'DOL Visualization'
p.xaxis.axis_label = 'Kilometer Point'
p.yaxis.axis_label = 'DOC'

show(p)

我正在使用 pandas 和散景。 我想要一個 plot，其中兩條 y 軸線來自兩個不同的列。 上面的代碼給出了以下錯誤和 html 中的木板散景 plot。

Expected y to reference fields in the supplied data source.

When a 'source' argument is passed to a glyph method, values that are sequences
(like lists or arrays) must come from references to data columns in the source.

For instance, as an example:

    source = ColumnDataSource(data=dict(x=a_list, y=an_array))

    p.circle(x='x', y='y', source=source, ...) # pass column names and a source

Alternatively, *all* data sequences may be provided as literals as long as a
source is *not* provided:

    p.circle(x=a_list, y=an_array, ...)  # pass actual sequences and no source

Answer 1

當您使用source作為圖形的輸入時，您只能添加字符串作為指向數據的指針。

在你的情況下使用

p.line(x= 'KP [km]', y ='DOL [m]', source = SOURCE )

代替

p.line(x= 'KP [km]', y =[['DOL [m]'], ['DOC [m]']], source = SOURCE )

如果要向一個圖形添加多條線，請為每條線調用一次p.line() 。

最小的例子

import pandas as pd

from bokeh.plotting import figure, show, output_notebook
from bokeh.models import ColumnDataSource
output_notebook()

df = pd.DataFrame({'a':[1,2,3], 'b':[4,5,6]})
source = ColumnDataSource(df)

p = figure(width=300, height=300)
p.line(x='index', y='a', source=source)
p.line(x='index', y='b', source=source, color='red')

show(p)

也可以看看

查看官方文檔中的多行示例。