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Home / Interview Subjects / Python Matplotlib
WithoutBook LIVE Mock Interviews Python Matplotlib Related interview subjects: 13

Interview Questions and Answers

Know the top Python Matplotlib interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 30 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Python Matplotlib interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

Explain the difference between `plt.show()` and `plt.savefig()` in Matplotlib.

`plt.show()` displays the plot interactively, while `plt.savefig()` saves the current figure to a file without displaying it.

Example:

plt.plot([1, 2, 3, 4], [10, 20, 25, 30])
plt.savefig('plot.png')
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Ques 2

Explain the difference between `plt.plot()` and `plt.scatter()`.

`plt.plot()` connects data points with lines, while `plt.scatter()` shows individual data points without connecting them.

Example:

plt.plot([1, 2, 3, 4], [10, 20, 25, 30])
plt.scatter([1, 2, 3, 4], [10, 20, 25, 30])
plt.show()
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Ques 3

What is the purpose of `plt.legend()` in Matplotlib?

`plt.legend()` is used to add a legend to the plot, providing information about the plotted data series.

Example:

plt.plot([1, 2, 3, 4], [10, 20, 25, 30], label='Line 1')
plt.legend()
plt.show()
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Ques 4

What is a subplot in Matplotlib?

A subplot is a way to organize multiple plots within a single figure. It is created using `plt.subplot()`.

Example:

plt.subplot(2, 1, 1)
plt.plot([1, 2, 3, 4], [10, 20, 25, 30])
plt.subplot(2, 1, 2)
plt.scatter([1, 2, 3, 4], [10, 20, 25, 30])
plt.show()
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Ques 5

What is the role of the `plt.xticks()` and `plt.yticks()` functions in Matplotlib?

`plt.xticks()` and `plt.yticks()` are used to customize the tick positions and labels on the x-axis and y-axis, respectively.

Example:

plt.plot([1, 2, 3, 4], [10, 20, 25, 30])
plt.xticks([1, 2, 3, 4], ['A', 'B', 'C', 'D'])
plt.show()
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Ques 6

What is the purpose of the `plt.imshow()` function in Matplotlib?

`plt.imshow()` is used to display images in Matplotlib plots.

Example:

import matplotlib.image as mpimg
img = mpimg.imread('image.png')
plt.imshow(img)
plt.show()
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Ques 7

How can you add text annotations to a Matplotlib plot?

Use the `plt.text()` function to add text annotations at specified coordinates on the plot.

Example:

plt.plot([1, 2, 3, 4], [10, 20, 25, 30])
plt.text(2, 15, 'Annotation')
plt.show()
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Ques 8

Explain the purpose of the `plt.pie()` function in Matplotlib.

`plt.pie()` is used to create a pie chart in Matplotlib, representing data in a circular statistical graphic.

Example:

sizes = [20, 30, 40, 10]
labels = ['A', 'B', 'C', 'D']
plt.pie(sizes, labels=labels, autopct='%1.1f%%')
plt.show()
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Ques 9

How can you create a logarithmic scale in Matplotlib?

Use the `plt.xscale()` and `plt.yscale()` functions with the argument 'log' to create a logarithmic scale on the x-axis and y-axis, respectively.

Example:

plt.plot([1, 2, 3, 4], [10, 20, 30, 40])
plt.xscale('log')
plt.yscale('log')
plt.show()
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Ques 10

How can you create error bars in a Matplotlib plot?

Use the `plt.errorbar()` function to create a plot with error bars.

Example:

x = [1, 2, 3, 4]
y = [10, 20, 25, 30]
error = [1, 2, 1, 3]
plt.errorbar(x, y, yerr=error, fmt='o', capsize=5)
plt.show()
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Ques 11

How can you create a violin plot in Matplotlib?

Use the `plt.violinplot()` function to create a violin plot, which is used for visualizing the distribution of data.

Example:

data = [np.random.normal(0, std, 100) for std in range(1, 4)]
plt.violinplot(data, showmedians=True)
plt.show()
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Ques 12

How can you create a polar plot in Matplotlib?

Use the `plt.polar()` function to create a polar plot, which is useful for visualizing data in circular coordinates.

Example:

theta = np.linspace(0, 2*np.pi, 100)
r = 1 + np.sin(3*theta)
plt.polar(theta, r)
plt.show()
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