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Identify the issue in this code:

medium📝 Debug Q6 of 15
SciPy - Sparse Matrices (scipy.sparse)
Identify the issue in this code:
from scipy.sparse import csr_matrix

matrix = csr_matrix([[0, 0], [0, 0]])
print(matrix.data[0])
ASyntaxError due to invalid import
BIndexError because matrix.data is empty
CValueError because zeros cannot be stored
DNo error, prints 0
Step-by-Step Solution
Solution:
  1. Step 1: Understand the matrix

    The matrix contains only zeros, so csr_matrix stores no non-zero data.
  2. Step 2: Check matrix.data

    matrix.data is an empty array because there are no non-zero elements.
  3. Step 3: Accessing matrix.data[0]

    Accessing the first element causes an IndexError due to empty data.
  4. Final Answer:

    IndexError because matrix.data is empty -> Option B
  5. Quick Check:

    Empty data array causes index error [OK]
Quick Trick: Empty sparse matrix has empty data array [OK]
Common Mistakes:
MISTAKES
  • Expecting zero in data array
  • Assuming no error on empty data access
  • Confusing data with full matrix

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