Line Plots

The Line plot method in Pygal generates a sequenced line plot with observations connected to each other over some x-index. Whether or not the index for $x$ values is provided, pygal will generate a y-based line plot. Whether a specific x-index is provided or not, Pygal automatically generates a y-based line plot. This feature often results in a cleaner appearance and provides a unique way to present line plots.

The examples below demonstrate how to generate lines plots with and without a corresponding $x$ indeces. The sunspots data is available here: https://public.websites.umich.edu/~mejn/computational-physics/sunspots.txt

import pygal
import numpy as np
import pandas as pd

sunspots = pd.read_csv('dataset/sunspots.txt', delimiter='\t', header=None)
sunspots.columns = ['month', 'sunspots']

sunspots.head()

	month	sunspots
0	0	58.0
1	1	62.6
2	2	70.0
3	3	55.7
4	4	85.0

Line Plot without an $x$ index

The code below generates a line plot using only the sunspots observations without the x-axis (months).

line_plot = pygal.Line()

line_plot.title = 'Sunspots Observations (1970 - 2000)'
line_plot.add('Sunspots', sunspots.sunspots[:30])

line_plot.render_in_browser()

Line Plot with $x$ index

The code below generates a line plot with the years as x index.

line_plot = pygal.Line( x_label_rotation = -35 )

line_plot.title = 'Subspots Observations (1970 - 2000)'
line_plot.x_labels = map(str, range(1970, 2000))
line_plot.add('Sunspots', sunspots.sunspots[:30])

#line_plot.render_in_browser()