How to set the coordinate axis in python plot (sample code sharing)

01. Load Library

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt

02. Sample Data

x = np.linspace(-np.pi*2, np.pi*2)
y1 = np.sin(x)
Y2=np.power (x, 2) * 0.05 # Exponential operation
df = pd.Dataframe({‘a’: y1, ‘b’: y2}, index=x)

1. Graphics at Default Settings

fig = plt.figure()
df.plot()
plt.show()

2. Set the font size and color of axis labels

fig = plt.figure()
df.plot()
plt.yticks(size=14, color=’grey’)
plt.xticks(size=14, color=’grey’)
plt.show()

3. Change vertical axis scale range

fig = plt.figure()
df.plot()
plt.ylim(-2, 3)
plt.yticks(size=14, color=’grey’)
plt.xticks(size=14, color=’grey’)
plt.show()

4. Replace horizontal axis scale label

xticks = [-2*np.pi, -3*np.pi/2, -np.pi, -np.pi/2, 0, np.pi/2, np.pi, 3*np.pi/2, 2*np.pi] xticklabes = [‘-2π’, ‘-3π/2’, ‘-π’, ‘-π/2’, 0, ‘π/2’, ‘π’, ‘3π/2’, ‘2π’ ] fig = plt.figure()
df.plot()
plt.ylim(-2, 3)
plt.yticks(size=14, color=’grey’)
plt.xticks(xticks, xticklabes, size=14, color=’grey’)
plt.show()

5. Move Axis to Center

xticks = [-2*np.pi, -3*np.pi/2, -np.pi, -np.pi/2, 0, np.pi/2, np.pi, 3*np.pi/2, 2*np.pi] xticklabes = [‘-2π’, ‘-3π/2’, ‘-π’, ‘-π/2’, 0, ‘π/2’, ‘π’, ‘3π/2’, ‘2π’ ] fig = plt.figure()

df.plot()
ax = plt.gca()
plt.ylim(-2, 3)
plt.yticks(size=14, color=’grey’)
plt.xticks(xticks, xticklabes, size=14, color=’grey’)

ax.spines[‘right’].set_color(‘none’)
ax.spines[‘top’].set_color(‘none’)
ax.spines[‘left’].set_position((‘data’, 0))
ax.spines[‘bottom’].set_position((‘data’, 0))

plt.show()

6. Set horizontal axis scale label to display at an oblique angle

xticks = [-2*np.pi, -3*np.pi/2, -np.pi, -np.pi/2, 0, np.pi/2, np.pi, 3*np.pi/2, 2*np.pi] xticklabes = [‘-2π’, ‘-3π/2’, ‘-π’, ‘-π/2’, 0, ‘π/2’, ‘π’, ‘3π/2’, ‘2π’ ] fig = plt.figure()

df.plot()
ax = plt.gca()

ax.spines[‘right’].set_color(‘none’)
ax.spines[‘top’].set_color(‘none’)
ax.spines[‘left’].set_position((‘data’, 0))
ax.spines[‘bottom’].set_position((‘data’, 0))

plt.ylim(-2, 3)
plt.yticks(size=14, color=’grey’)
plt.xticks(xticks, xticklabes, rotation=-30, size=14, color=’grey’)

plt.show()

This is how python plot sets the coordinate axis.