Matplotlib.pyplot.contourf() in Python
Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. Pyplot is a state-based interface to a Matplotlib module which provides a MATLAB-like interface.
matplotlib.pyplot.contourf() Function
The contourf() function in pyplot module of matplotlib library is used to plot contours. But contourf draw filled contours, while contourf draws contour lines.
Syntax: matplotlib.pyplot.contourf(\*args, data=None, \*\*kwargs)
Parameters: This method accept the following parameters that are described below:
- X, Y: These parameter are the coordinates of the values in Z.
- Z : This parameter is the height values over which the contour is drawn.
- levels : This parameter is used to determine the numbers and positions of the contour lines / regions.
Returns: This returns the following:
- c :This returns the
QuadContourSet
.
Below examples illustrate the matplotlib.pyplot.contourf() function in matplotlib.pyplot:
Example #1:
import numpy as np
import matplotlib.pyplot as plt
from numpy import ma
from matplotlib import ticker, cm
N = 1000
x = np.linspace( - 6.0 , 6.0 , N)
y = np.linspace( - 7.0 , 7.0 , N)
X, Y = np.meshgrid(x, y)
Z1 = np.exp(X * Y)
z = 50 * Z1
z[: 5 , : 5 ] = - 1
z = ma.masked_where(z < = 0 , z)
cs = plt.contourf(X, Y, z,
locator = ticker.LogLocator(),
cmap = "bone" )
cbar = plt.colorbar(cs)
plt.title( 'matplotlib.pyplot.contourf() Example' )
plt.show()
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Output:
Example #2:
import matplotlib.pyplot as plt
import numpy as np
x = np.linspace( - 3 , 15 , 50 ).reshape( 1 , - 1 )
y = np.linspace( - 3 , 15 , 20 ).reshape( - 1 , 1 )
z = np.cos(x) * 2 - np.sin(y) * 2
x, y = x.flatten(), y.flatten()
cs = plt.contourf(x, y, z,
hatches = [ '-' , '/' ,
'\\', ' / / '],
cmap = 'Greens' ,
extend = 'both' ,
alpha = 1 )
plt.colorbar(cs)
plt.title( 'matplotlib.pyplot.contourf() Example' )
plt.show()
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Output:
Last Updated :
21 Apr, 2020
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