Matplotlib.axes.Axes.get_ygridlines() in Python

Last Updated : 21 Apr, 2020

Matplotlib is a library in Python and it is numerical - mathematical extension for NumPy library. The Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.

matplotlib.axes.Axes.get_ygridlines() Function

The Axes.get_ygridlines() function in axes module of matplotlib library is used to return the y grid lines as a list of Line2D instances.

Syntax: Axes.get_ygridlines(self) Parameters: This method does not accepts any parameters. Return value: This method returns the y grid lines as a list of Line2D instances.

Below examples illustrate the matplotlib.axes.Axes.get_ygridlines() function in matplotlib.axes: Example 1:

Python3

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import matplotlib.transforms as mtransforms


fig, ax = plt.subplots()
ax.plot(range(12, 24), range(12))
ax.set_yticks((2, 5, 7, 10))
ax.set_yticklabels(("Label-1", "Label-2",
                    "Label-3", "Label-4"))
 
w = ax.get_ygridlines()
ax.text(15, 8, "ygridlines values : ", 
       fontweight ="bold")
xx = 8
for i in w:
    ax.text(15, xx-0.55, str(i), 
           fontweight ="bold")
    xx-= 0.55

fig.suptitle('matplotlib.axes.Axes.get_ygridlines()\
 function Example\n\n', fontweight ="bold")
plt.show()

Output:

Example 2:

Python3

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.mlab as mlab
import matplotlib.gridspec as gridspec


fs = 1000
t = np.linspace(0, 0.3, 301)
A = np.array([2, 8]).reshape(-1, 1)
f = np.array([150, 140]).reshape(-1, 1)
xn = (A * np.sin(2 * np.pi * f * t)).sum(axis = 0)
xn += 5 * np.random.randn(*t.shape)
  
fig, ax = plt.subplots()
  
yticks = [-40, -15, 10]
  
ax.psd(xn, NFFT = 301, Fs = fs, 
      window = mlab.window_none, 
      pad_to = 1024,
      scale_by_freq = True)

ax.set_yticks(yticks)
ax.set_yticklabels(("Low-1", "High", "Low-2"))
ax.grid(True)
 
w = ax.get_ygridlines()
ax.text(150, 6, "ygridlines values : ", 
        fontweight ="bold")
xx = 6
for i in w:
    ax.text(150, xx-3, str(i), fontweight ="bold")
    xx-= 3

fig.suptitle('matplotlib.axes.Axes.get_ygridlines()\
 function Example\n\n', fontweight ="bold")
plt.show()