Matrix inverse (inv) in SciPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the function that calculates the inverse of a matrix.

SciPy

from scipy.linalg import [1]

matrix = [[1, 2], [3, 4]]
inv_matrix = inv(matrix)
print(inv_matrix)

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

Ainverse

Binv_matrix

Cinvert

Dinv

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'inverse' instead of 'inv'.

Trying to import a non-existing function like 'invert'.

The function to calculate the inverse of a matrix in scipy.linalg is inv.

2fill in blank

medium

Complete the code to create a 2x2 numpy array matrix.

SciPy

import numpy as np

matrix = np.array([1])
print(matrix)

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A[[1, 3], [2, 4]]

B[1, 2, 3, 4]

C[[1, 2], [3, 4]]

D[[1, 2, 3], [4, 5, 6]]

Attempts:

3 left

💡 Hint

Common Mistakes

Using a flat list instead of nested lists.

Using wrong dimensions like 2x3.

A 2x2 matrix is a list of two lists, each with two elements, like [[1, 2], [3, 4]].

3fill in blank

hard

Fix the error in the code to correctly calculate the inverse of the matrix.

SciPy

from scipy.linalg import inv
import numpy as np

matrix = np.array([[1, 2], [3, 4]])
inv_matrix = [1](matrix)
print(inv_matrix)

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

Ainv

Binv_matrix

Cinvert

Dinverse

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'inverse' or 'invert' which are not defined.

Trying to call the variable name as a function.

The correct function to calculate the inverse is inv, not 'inverse' or 'invert'.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each element to its inverse value.

SciPy

matrix = [1, 2, 4, 5]
inverse_map = { [1]: 1/[2] for [1] in matrix }
print(inverse_map)

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Ax

Bi

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names before colon and after 'for'.

Using variable names not defined in the comprehension.

In dictionary comprehension, the variable name before the colon and after 'for' must be the same. Here, 'x' is used consistently.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each number to its inverse if the number is not zero.

SciPy

numbers = [1, 2, 0, 4]
inverse_dict = { [1]: 1/[2] for [3] in numbers if [2] != 0 }
print(inverse_dict)

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Anum

Dn

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causing NameError.

Not checking for zero before division.

Use the same variable name 'num' consistently in the comprehension for clarity and correctness.