[Solved] Given the following code, what will be the output of print(csc_matrix.indptr)? import numpy as np from scipy.... Given the following code, what will be the output of print(csc_matrix.indptr)? | SciPy

SciPy - Sparse Matrices (scipy.sparse)

Given the following code, what will be the output of print(csc_matrix.indptr)?

import numpy as np
from scipy.sparse import csc_matrix

arr = np.array([[0, 0, 3],
                [4, 0, 0],
                [0, 5, 6]])
csc_matrix = csc_matrix(arr)

A[0 2 3 4]

B[0 1 2 3]

C[0 1 3 4]

D[0 1 2 4]

Step-by-Step Solution

Solution:

Step 1: Understand indptr in CSC format
indptr array shows column start indices in data arrays. For 3 columns, length is 4.
Step 2: Count non-zero elements per column
Column 0 has 1 non-zero (4), column 1 has 1 non-zero (5), column 2 has 2 non-zeros (3,6). So indptr = [0,1,2,4].
Final Answer:
[0 1 2 4] -> Option D
Quick Check:
indptr counts cumulative non-zeros per column = B [OK]

Quick Trick: Count non-zeros per column cumulatively for indptr [OK]

Common Mistakes:

MISTAKES

Counting rows instead of columns
Mixing up indptr with indices array
Off-by-one errors in cumulative counts

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More SciPy Quizzes

Given the following code, what will be the output of print(csc_matrix.indptr)?

Step 1: Understand indptr in CSC format

Step 2: Count non-zero elements per column

Final Answer:

Quick Check:

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