Polar axes in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a polar plot using matplotlib.

Matplotlib

import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111, projection=[1])
plt.show()

Drag options to blanks, or click blank then click option'

A"3d"

B"polar"

C"rectilinear"

D"scatter"

Attempts:

3 left

💡 Hint

Common Mistakes

Using '3d' projection instead of 'polar'.

Leaving the projection parameter empty.

Using 'scatter' which is not a projection type.

The projection parameter must be set to "polar" to create a polar plot.

2fill in blank

medium

Complete the code to plot points on a polar axis with radius values.

Matplotlib

import numpy as np
import matplotlib.pyplot as plt

theta = np.linspace(0, 2*np.pi, 100)
r = np.abs(np.sin(theta))

fig, ax = plt.subplots(subplot_kw={{'projection': 'polar'}})
ax.plot(theta, [1])
plt.show()

Drag options to blanks, or click blank then click option'

Anp.cos(theta)

Btheta

Cr

Dnp.linspace(0, 1, 100)

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the angle array twice instead of radius.

Passing a cosine function instead of radius.

Passing a linear space unrelated to radius.

The radius values r must be passed as the second argument to ax.plot() to plot points on the polar axis.

3fill in blank

hard

Fix the error in the code to correctly set the zero location of the polar plot.

Matplotlib

import matplotlib.pyplot as plt

fig, ax = plt.subplots(subplot_kw={{'projection': 'polar'}})
ax.set_theta_zero_location([1])
plt.show()

Drag options to blanks, or click blank then click option'

A90

B0

C'East'

D'N'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an integer instead of a string.

Using degrees like 90 instead of a direction string.

Using invalid strings like 'East' instead of 'E'.

The set_theta_zero_location method expects a string indicating the direction, such as 'N' for north.

4fill in blank

hard

Fill both blanks to create a scatter plot on polar axes with red points.

Matplotlib

import numpy as np
import matplotlib.pyplot as plt

angles = np.linspace(0, 2*np.pi, 50)
radii = np.random.rand(50)

fig, ax = plt.subplots(subplot_kw={{'projection': 'polar'}})
ax.scatter([1], [2], color='red')
plt.show()

Drag options to blanks, or click blank then click option'

Aangles

Bradii

Cnp.linspace(0, 1, 50)

Dnp.random.rand(50)

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping angles and radii in the scatter function.

Using unrelated arrays for angles or radii.

Forgetting to specify the projection as 'polar'.

The scatter plot on polar axes requires angles as the first argument and radii as the second argument.

5fill in blank

hard

Fill all three blanks to create a polar bar plot with blue bars and set the direction clockwise.

Matplotlib

import numpy as np
import matplotlib.pyplot as plt

theta = np.linspace(0.0, 2 * np.pi, 8, endpoint=False)
radii = 10 * np.random.rand(8)
width = np.pi / 4 * np.random.rand(8)

fig, ax = plt.subplots(subplot_kw={{'projection': 'polar'}})
bars = ax.bar([1], [2], width=[3], color='blue', alpha=0.5)
ax.set_theta_direction(-1)
plt.show()

Drag options to blanks, or click blank then click option'

Atheta

Bradii

Cwidth

Dnp.linspace(0, 1, 8)

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of arguments in ax.bar.

Using unrelated arrays for any of the arguments.

Not setting the projection to 'polar'.

The ax.bar function for polar plots requires angles, radii, and widths for the bars.