Python Bokeh – Plotting Multiple Lines on a Graph

Bokeh is a Python interactive data visualization. It renders its plots using HTML and JavaScript. It targets modern web browsers for presentation providing elegant, concise construction of novel graphics with high-performance interactivity.

Bokeh can be used to plot multiple lines on a graph. Plotting multiple lines on a graph can be done using the multi_line() method of the plotting module.

plotting.figure.multi_line()

Syntax : multi_line(parameters)

Parameters :

• xs : x-coordinates of the lines
• ys : y-coordinates of the lines
• line_alpha : percentage value of line alpha, default is 1
• line_cap : value of line cap for the line, default is butt
• line_color : color of the line, default is black
• line_dash : value of line dash such as : solid, dashed, dotted, dotdash, dashdot [default is solid ]
• line_dash_offset : value of line dash offset, default is 0
• line_join : value of line join, default in bevel
• line_width : value of the width of the line, default is 1
• name : user-supplied name for the model
• tags : user-supplied values for the model

Other Parameters :

• alpha : sets all alpha keyword arguments at once
• color : sets all color keyword arguments at once
• legend_field : name of a column in the data source that should be used
• legend_group : name of a column in the data source that should be used
• legend_label : labels the legend entry
• muted : determines whether the glyph should be rendered as muted or not, default is False
• name : optional user-supplied name to attach to the renderer
• source : user-supplied data source
• view : view for filtering the data source
• visible : determines whether the glyph should be rendered or not, default is True
• x_range_name : name of an extra range to use for mapping x-coordinates
• y_range_name : name of an extra range to use for mapping y-coordinates
• level : specifies the render level order for this glyph

Returns : an object of class GlyphRenderer

Example 1 : In this example we will be using the default values for plotting the graph.

# importing the modules
from bokeh.plotting import figure, output_file, show

# file to save the model
output_file("gfg.html")

# instantiating the figure object
graph = figure(title = "Bokeh Multi Line Graph")

# the points to be plotted
xs = [[1, 2, 3, 4, 5], [-4, -2, 0, 2, 4]]
ys = [[5, 3, 8, 0], [5, -4, 10, -2, 5]]

# plotting the graph
graph.multi_line(xs, ys)

# displaying the model
show(graph)

Output :

Example 2 : In this example we will be plotting the multiple lines with various other parameters

# importing the modules
from bokeh.plotting import figure, output_file, show
from bokeh.palettes import magma

# file to save the model
output_file("gfg.html")

# instantiating the figure object
graph = figure(title = "Bokeh Multiple Line Graph")

# name of the x-axis
graph.xaxis.axis_label = "x-axis"

# name of the y-axis
graph.yaxis.axis_label = "y-axis"

# the points to be plotted
x = [n for n in range(-100, 101)]
x.reverse()
xs = [[n, 0] for n in x]
y1 = [n for n in range(1, 101)]
y1.reverse()
y = [n for n in range(1, 101)] + [0] + y1
ys = [[0, n] for n in y]

# color of the lines
line_color = magma(201)

# plotting the graph
graph.multi_line(xs, ys,
                 line_color = line_color)

# displaying the model
show(graph)

Output :