Matplotlib.pyplot.triplot() in python
Last Updated :
19 Apr, 2020
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. There are various plots which can be used in Pyplot are Line Plot, Contour, Histogram, Scatter, 3D Plot, etc.
matplotlib.pyplot.triplot() Function:
The triplot() function in pyplot module of matplotlib library is used to draw a unstructured triangular grid as lines and/or markers.
Syntax: matplotlib.pyplot.triplot(*args, **kwargs)
Parameters: This method accept the following parameters that are described below:
Returns: This returns the list of 2 Line2D containing following:
- The lines plotted for triangles edges.
- The markers plotted for triangles nodes
Below examples illustrate the matplotlib.pyplot.triplot() function in matplotlib.pyplot:
Example 1:
import matplotlib.pyplot as plt
import matplotlib.tri as mtri
import numpy as np
x = np.asarray([ 0 , 1 , 2 , 3 , 0.5 , 1.5 ,
2.5 , 1 , 2 , 1.5 ])
y = np.asarray([ 0 , 0 , 0 , 0 , 1.0 ,
1.0 , 1.0 , 2 , 2 , 3.0 ])
triangles = [[ 0 , 1 , 4 ], [ 1 , 2 , 5 ],
[ 2 , 3 , 6 ], [ 1 , 5 , 4 ],
[ 2 , 6 , 5 ], [ 4 , 5 , 7 ],
[ 5 , 6 , 8 ], [ 5 , 8 , 7 ],
[ 7 , 8 , 9 ]]
triang = mtri.Triangulation(x, y, triangles)
z = np.cos( 1.5 * x) * np.cos( 1.5 * y)
plt.tricontourf(triang, z)
plt.triplot(triang, 'go-' )
plt.title( 'matplotlib.pyplot.triplot() Example' )
plt.show()
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Output:
Example 2:
import matplotlib.pyplot as plt
import matplotlib.tri as tri
import numpy as np
n_angles = 24
n_radii = 9
min_radius = 0.5
radii = np.linspace(min_radius, 0.9 ,
n_radii)
angles = np.linspace( 0 , 3 * np.pi, n_angles,
endpoint = False )
angles = np.repeat(angles[..., np.newaxis],
n_radii, axis = 1 )
angles[:, 1 :: 2 ] + = np.pi / n_angles
x = (radii * np.cos(angles)).flatten()
y = (radii * np.sin(angles)).flatten()
triang = tri.Triangulation(x, y)
triang.set_mask(np.hypot(x[triang.triangles].mean(axis = 1 ),
y[triang.triangles].mean(axis = 1 ))
< min_radius)
plt.triplot(triang, 'go-' , lw = 1 )
plt.title( 'matplotlib.pyplot.triplot() Example' )
plt.show()
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Output:
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