4.20. DataFrame Plotting

• https://pandas.pydata.org/pandas-docs/stable/user_guide/visualization.html

4.20.1. Plot kinds

• line - Line Plot

• bar - Vertical Bar Plot

• barh - Horizontal Bar Plot

• hist - Histogram

• box - Boxplot

• density, kde - Kernel Density Estimation Plot

• area - Area Plot

• pie - Pie Plot

• scatter - Scatter Plot

• hexbin - Hexbin Plot

4.20.2. Parameters

Table 4.10. Parameters

Parameter	Default value
x	None
y	None
kind	line
ax	None
subplots	False
sharex	None
sharey	False
layout	None
figsize	None
use_index	True
title	None
grid	None
legend	True
style	None
logx	False
logy	False
loglog	False
xticks	None
yticks	None
xlim	None
ylim	None
rot	None
fontsize	None
colormap	None
table	False
yerr	None
xerr	None
secondary_y	False
sort_columns	False
xlabel	None
ylabel	None

Table 4.11. Parameters

Parameter	Type	Default	Description
data	Series or DataFrame	None	The object for which the method is called
x	label or position	None	Only used if data is a DataFrame
y	label, position or list of label, positions	None	Allows plotting of one column versus another. Only used if data is a DataFrame.
kind	str	line	line, bar, barh, hist, box, kde, density, area, pie, scatter, hexbin
figsize	tuple	None	(width, height) in inches
use_index	bool	True	Use index as ticks for x axis
title	str or list	None	Title to use for the plot. If a string is passed, print the string at the top of the figure. If a list is passed and subplots is True, print each item in the list above the corresponding subplot.
grid	bool	None	(matlab style default) Axis grid lines
legend	bool or 'reverse'	None	Place legend on axis subplots
style	list or dict	None	matplotlib line style per column
logx	bool or 'sym'	False	Use log scaling or symlog scaling on x axis
logy	bool or 'sym'	False	Use log scaling or symlog scaling on y axis
loglog	bool or 'sym'	False	Use log scaling or symlog scaling on both x and y axes
xticks	sequence	None	Values to use for the xticks
yticks	sequence	None	Values to use for the yticks
xlim	2-tuple/list	None
ylim	2-tuple/list	None
rot	int	None	Rotation for ticks (xticks for vertical, yticks for horizontal plots)
fontsize	int	None	Font size for xticks and yticks
colormap	str or matplotlib colormap object	default None	Colormap to select colors from. If string, load colormap with that name from matplotlib.
colorbar	bool	None	If True, plot colorbar (only relevant for 'scatter' and 'hexbin' plots)
position	float	0.5 (center)	Specify relative alignments for bar plot layout. From 0 (left/bottom-end) to 1 (right/top-end).
table	bool, Series or DataFrame	False	If True, draw a table using the data in the DataFrame and the data will be transposed to meet matplotlib's default layout. If a Series or DataFrame is passed, use passed data to draw a table.
yerr	DataFrame, Series, array-like, dict or str	None	Equivalent to xerr.
xerr	DataFrame, Series, array-like, dict or str	None	Equivalent to yerr.
mark_right	bool	True	When using a secondary_y axis, automatically mark the column labels with "(right)" in the legend.
**kwds	keywords	None	Options to pass to matplotlib plotting method.

4.20.3. Prepare Data

import pandas as pd


DATA = 'https://raw.githubusercontent.com/AstroMatt/book-python/master/_data/csv/iris-clean.csv'

df = pd.read_csv(DATA)
df.columns = [
    'Sepal length',
    'Sepal width',
    'Petal length',
    'Petal width',
    'Species'
]

4.20.4. Generate Plot

4.20.4.1. Line Plot

• default

df.plot()

df.plot(kind='line')

Figure 4.19. Line Plot

4.20.4.2. Vertical Bar Plot

df.plot(kind='bar')

Figure 4.20. Vertical Bar Plot

4.20.4.3. Horizontal Bar Plot

df.plot(kind='barh')

Figure 4.21. Horizontal Bar Plot

4.20.4.4. Histogram

df.plot(kind='hist')

Figure 4.22. Histogram

4.20.4.5. Boxplot

df.plot(kind='box')

Figure 4.23. Boxplot

4.20.4.6. Kernel Density Estimation Plot

df.plot(kind='density')

df.plot(kind='kde')

Figure 4.24. Kernel Density Estimation Plot

4.20.4.7. Area Plot

df.plot(kind='area')

Figure 4.25. Area Plot

Figure 4.26. Cumulative Flow Diagram in Atlassian Jira

4.20.4.8. Pie Plot

df.plot(kind='pie')

Figure 4.27. Pie Plot

4.20.4.9. Scatter Plot

df.plot(kind='scatter')

Figure 4.28. Scatter Plot

4.20.4.10. Hexbin Plot

df.plot(kind='hexbin')

Figure 4.29. Hexbin Plot

4.20.5. Other

4.20.5.1. Hist

import matplotlib.pyplot as plt
import pandas as pd


DATA = 'https://raw.githubusercontent.com/AstroMatt/book-python/master/_data/csv/iris-clean.csv'

df = pd.read_csv(DATA)
df.hist()
plt.show()

Figure 4.30. Visualization using hist

4.20.5.2. Density

import matplotlib.pyplot as plt
import pandas as pd


DATA = 'https://raw.githubusercontent.com/AstroMatt/book-python/master/_data/csv/iris-clean.csv'

df = pd.read_csv(DATA)
df.plot(kind='density', subplots=True, layout=(2,2), sharex=False)
plt.show()

Figure 4.31. Visualization using density

4.20.5.3. Box

import matplotlib.pyplot as plt
import pandas as pd


DATA = 'https://raw.githubusercontent.com/AstroMatt/book-python/master/_data/csv/iris-clean.csv'

df = pd.read_csv(DATA)
df.plot(kind='box', subplots=True, layout=(2,2), sharex=False, sharey=False)
plt.show()

Figure 4.32. Visualization using density

4.20.5.4. Scatter matrix

• The in pandas version 0.22 plotting module has been moved from pandas.tools.plotting to pandas.plotting

• As of version 0.19, the pandas.plotting library did not exist

import matplotlib.pyplot as plt
import pandas as pd
from pandas.plotting import scatter_matrix


DATA = 'https://raw.githubusercontent.com/AstroMatt/book-python/master/_data/csv/iris-clean.csv'

df = pd.read_csv(DATA)
scatter_matrix(df)
plt.show()

Figure 4.33. Visualization using density

4.20.6. Actinograms

4.20.7. Further Reading

• https://www.data-to-viz.com/#explore

• https://www.data-to-viz.com/img/poster/poster_big.png

4.20.8. Assignments

4.20.8.1. DataFrame Plot

• Assignment: DataFrame Plot

• Last update: 2020-10-01

• Complexity level: medium

• Lines of code to write: 15 lines

• Estimated time of completion: 21 min

• Filename: solution/df_plot.py

English:

1. Use data from "Given" section (see below)

2. Read data from DATA as sensors: pd.DataFrame

3. Select Luminance stylesheet

4. Parse column with dates

5. Select desired date and location, then resample by hour

6. Display chart (line) with activity hours in "Sleeping Quarters upper" location

7. Active is when Luminance is not zero

8. Easy: for day 2019-09-28

9. Advanced: for each day, as subplots

Polish:

1. Użyj danych z sekcji "Given" (patrz poniżej)

2. Wczytaj dane z DATA jako sensors: pd.DataFrame

3. Wybierz arkusz Luminance

4. Sparsuj kolumny z datami

5. Wybierz pożądaną datę i lokację, następnie próbkuj co godzinę

6. Aktywność jest gdy Luminance jest różna od zera

7. Wyświetl wykres (line) z godzinami aktywności w dla lokacji "Sleeping Quarters upper"

8. Łatwe: dla dnia 2019-09-28

9. Zaawansowane: dla wszystkich dni, jako subplot

Given:

DATA = 'https://raw.githubusercontent.com/AstroMatt/book-python/master/_data/xlsx/sensors-optima.xlsx'
WHERE = 'Sleeping Quarters upper'
WHEN = '2019-09-28'

Hints:

• pd.Series.apply(np.sign) Signum

• pd.Series.resample('H').sum()